Both "biological sex" and "legal gender" are considerably more nebulous than you're assuming.

Let's say you define "biological sex" by genotype, seems unambiguous enough, right? It's a pretty good bet someone is 46,XX or 46,XY based on sex assigned at birth, but generally people don't actually know for sure.

Likewise, in many jurisdictions, you don't have a legal gender, you have a collection of gender markers. Ironically, trans people are often the only people who actually have an explicit declaration of their gender by a court or other legal mechanism. For cis people, the fact that it's a fractured mess generally doesn't matter.

Please don't. If there's some of particular interest, link to it with some commentary.

I think you're dismissing their point too readily. It's true that there's nothing I share with every other afab person on the planet other than a box that got ticked by looking at our genitals when we were born, but if I'm looking for someone who shares a particular gendered experience, my best bet is probably another transmasculine person, particularly one who transitioned at a similar age. It's reductionist and transphobic to argue that one's socialisation is determined by gender assigned at birth, but it's also reductionist to pretend it's irrelevant.

What does stealth mean for you? What aspects have you worrying that it'll result in isolation?

I'll be honest, I have a bias here -- I do find being in situations where I feel I can't talk about being trans isolating and find/found stealth (or even the state of "waiting to make up my mind") fairly unhealthy. But my definition of stealth is something like "willing to take steps to ensure others do not find out one is trans even in scenarios where safety isn't a consideration". I probably fit some people's working definitions of stealth, though -- I generally tell people I'm trans in two scenarios: it's immediately relevant or I feel like our relationship has become close enough that I would like them to know. That has been how things have evolved naturally as I've gotten further from the "active" phase of transition and moved around the country. I actively talk about being trans at work (okay, that's maybe no one's definition of stealth), but only in diversity-focused contexts, so do my immediate coworkers know I'm trans? Nope, they don't show up to that stuff. I personally value having trans friends/community, but if that's not important to you, you're not obligated to seek out trans people in a new place (and, honestly, a lot of trans spaces are very transition-focused by necessity, so finding community can be hard if you're in a more steady-state transition-wise).

On the top surgery front, I have a friend group who figured out I was trans after, oh, a decade of knowing me. My entire medical transition, including top surgery, took place in front of their faces. I met them at a time where it was a tossup how people read my gender and it was more important to me then that they read me as a guy than that I be out, and then a decade went by and I'd became close to them (i.e. at least some entered the category of "people I actively want to know I'm trans") and it was like "So, uh, funny story..."

tl;dr Moving as an adult is kind of isolating by definition and you have to rebuild community. If you don't seek out trans community as part of that rebuilding, odds are you'll end up as stealth as you want.

It's worth noting that the surgeons who do top surgery and the surgeons who do mastectomies or reconstruction for breast cancer often aren't the same people (on top of that, I believe it's common for the person doing the actual "cutting out cancer" part and the person doing the reconstruction to be separate people)--they're fairly distinct medical communities. This may be changing a bit in the US now that there's insurance coverage for top surgery, but they're still pretty different worlds, afaik. (I actually knew someone who had discovered he had breast cancer as he was preparing for top surgery. It did upend the plan somewhat, but he happened to be seeing a surgeon who actually saw cancer patients, so it was less disruptive than it could have been. I suspect the surgeon I saw would have said "yeah, sorry, can't help you".)

Honestly, did we ever de-pathologize dysphoria?

It has become someone fashionable over the years to slag off the "genderbread person" as overly focused on the binary. However, long before there was an infographic (or honestly before anyone had coined the word infographic), this was floating around the west coast as a workshop exercise called Gender Gumby, and part of the point was that framing things as a spectrum between two poles doesn't really work and it's a fairly futile exercise--no one, cis or trans, is going to end up being able to place themselves on these lines and explain their choices without resorting to gender stereotypes.

Southern Europe generally isn't particularly progressive. A number of southern European countries are quite conservative in the sense of "things are slow to change".

I normally hate posts like these--they're almost inevitably too "I'm now the expert" but I actually thought this one was lovely, I think because it was mostly reflecting on the author's experience.

And, really, part of me aches for the world of fifteen years ago where trans people were ignored. One of the great lessons of my transition was that people are generally decent and will try to do the right thing and treat others well, and I don't know that that would happen today--clueless cis people can default to being decent, even though they're steeped in a transphobic society, but a lot of those once clueless cis people now have been primed to actively hate trans people.

That doesn't mean it's not tiring.

But also, why does the norm need to be hetero vs "people are varied". Sure, most people are straight, but that doesn't mean it automatically has to be the default assumption, that's just a choice made by a... heteronormative society. Most of the time, we aren't in situations where we actually need to assume someone's sexual orientation, so we don't need to play the odds, as it were.

Though it's worth mentioning that it's crap as an "am I trans" thought experiment. I am long post-medical transition and my reaction is "well that'd be weird, but whatever, I'd get on with life, I suppose" and then I remember I've been there, done that! Somehow transitioning was very much about my body (top surgery was like a switch flipping) and also not about my body.

There's also "too old" in the sense of "too old to give a shit". I don't think my grandad "gets" me being trans, but he had definitely decided he is too old to care and was like "Okay, name, pronouns, got it, don't bother explaining" and proceeded to be the only family member who was perfect at it.

(It's actually kind of fascinating to see what language he comes up with on his own. Somehow, he has never learned what "transition" is and says things like "When he was being a girl..." which is simultaneously "getting it" and kind of cringe.)