Earlier quoted context omitted.
/tmp is often not tmpfs, in fact. /dev/shm or /var/run are.
Yes, and? It still is very common to find. Turns out things aren't homogeneous. People often both die forever-alone and happily married, too. I already said it's up to the distribution. I wasn't really interested in splitting it more than I have, I hoped to avoid it... but let's go. It's been upstream over a decade https://github.com/systemd/systemd/commits/main/units/tmp.mo... Participation, as always, has been/rema…
Ubuntu uses systemd. And yet it doesn't use tmpfs for /tmp. I literally just even installed 24.04 right now (new LTS from 3 weeks ago!) just to verify this hadn't somehow changed since the last time I had checked, and it still hadn't.
I'm not here to argue or play word games, I was just trying to point out that this isn't some kind of niche setup. The way you make it sound when you talk about Fedora or s6 or whatever gives readers the impression that they can assume /tmp is on tmpfs on anything mainstream & modern, but that's simply not the case -- it's not the case on the second(?) most popular distro.
That's all I was trying to convey.