Its been about 5 years since the last time I was job hunting, so things might have changed. I did that email after rejection a few times, but the only reply I ever got was a "Sorry, we can't discuss that."
Someone on reddit mentioned that they straight up asking at the end of the interview, so I started doing that. I did that at my current job, even.
During those final moments of the interview when they go "I think thats all we need, do you have any final questions for us?" I would ask something along the lines of "Based on this interview, what would you see as my largest opportunity for improvement to be a better fit for this role?"
Try not to phrase it in a negative way or in a way that would make them highlight downsides, like "Is there anything about this interview that makes you think I'm not suited for this job?" The last think you want is for them to leave with the most negative aspects fresh in mind.
Obviously theres a risk of sounding like you already feel like youre not getting the job, but it depends on the recruiter and any reasonable person would view it as you looking for opportunities to improve yourself, and that you're willing to go the extra step in filling their need.
Honestly? Not much.
I grew up in the countryside, there was maybe like 50 kids in my entire school. Somehow I became the main bully victim. Later I spent a few summers at the grocery store which doubled as a cafe in the weekends, and honestly it showed me the adults weren't any better with their constant gossiping and rumour spreading.
I got out of there as fast as I could afford it. It took a few tries in different places both big and small, but I eventually landed on my feet in a small city.
Still close enough to nature that the countryside of me doesnt feel cramped. Found my crowd, made friends, and discovered passions I never knew I had. Life is pretty good right about now. Bought an apartment with my partner a few years ago. Now we're gonna be parents soon!
I've reestablished connection with my family too. We've talked it all through, and now I go home to visit and spend time with them once or twice a year, so I guess that's the answer to your question. Anyone else there I couldn't care less for.