throwing out objective progress to hold onto a broken system designed for 1960s computing is just dumb

Preach.

I had to battle with the fucking initd and upstard before systemd. Those stupid headers of the scripts in /etc/init.d/ we wonderfully undocumented, didn't have syntax checks, depended on a bunch of other shell scripts that didn't have any damn comments in them.

systemd was going to happen sooner or later because nobody was going to put up with that bullshit forever.

Those people arguing about "do one thing right" blablabla don't care about principles, they care about superiority. They want to feel like they're the minority who can do stuff so that in forums they can be toxic and respond with "RTFM" or "LMGTFY". They don't want it easier and more functional, they want it hard so that they can gatekeep.
Like a bunch of Catholics: I experienced pain, so you have to too!

systemd can containerize services! To do that kind of stuff with initd, you'd have to know how create process-, user-, and network namespaces, and a bunch of other stuff.

I mean to a certain degree, I can understand if people find a problem with Poetterings approach of doing things !CORRECTLY!. Like, systemd-resolved resolving A-records with multiple addresses ina deterministic fashion because it's not defined not to be deterministic, and because actual load balancing would be better. It's not wrong, but it's breaking everything. And it got patched after some uproar. And there are a few things like that.

But at the same time - I don't think people appreciate how hard doing process management right on linux can be, especially if the daemon to run is shitty. Like, init scripts just triggering the shutdown port on a tomcat - except the tomcat is stuck and not reacting to the normal shutdown port and now you have a zombie process and an init script in a fucked up state. Or, just killing the main process and for some reason not really removing the children, now there's zombies all over the place. Or, not trying appropriate shutdown procedures first and just killing things, "because it's easier" - except my day just got harder with a corrupt dataset. Or, just trying soft and "Pwease wexit Mr Pwocess" signals and then just giving up. Or having "start" just crash because there was a stale PID from an OOM killed process around. Man I'm getting anxiety just thinking about this.

And that's just talking about ExecStart and ExecStop, pretty much, which I have done somewhat correct in a few init scripts back in the day (over months of iteration of edge cases). Now start thinking about the security features systemd-analyze can tell you about, like namespaces, unmapping syscalls, masking parts of the filesystem, ... imagine doing that with the jankyness of the average init.d script. At that point I'd start thinking about rebooting systems instead of trying to restart services, honestly.

And similarly, I'm growing fond of things like systemd-networkd, systemd-timesyncd. I've had to try to manage NetworkManager automatically and jeez... Or just directly handling networking with network-scripts. Always a pleasure. Chucking a bunch of pretty readable ini-files into /etc/systemd/networkd is a blessing. They are even readable even to people rather faint on the networking heart.

I thought people hate systemd because it’s a resource hog compared to OpenRC. TIL i guess

I was with you until the last paragraph. Just about every init system is different from historical init systems. Do you really think OpenRC or runit or any of the other init systems people are using have any similarity to SysV init? I think you're attacking a strawman in the last paragraph. (Edit: Except Slackware users. Slackware still does init the way it's traditionally been done, but I can't think of anyone else who does)

Best answer I've ever read ☝🏻☺️

Solid answer.