@phnt /tmp being a tmpfs is very old, it's just a fuss now because now enterprise distros are also adopting that, but well most of them where also annoyingly running rm -fr /tmp/* at boot (which with a non-parallelized service manager gets annoyingly slow).
But /var/tmp should not be a tmpfs, at least to me that's like the whole point of /var/tmp, and well if some distros gets particularly annoying, /var/cache is also a possibility.