Maybe putting the cleanup task for /var/tmp on a longer timer and warning users ahead of time of impending deletion (maybe 3 days before, 2 days, etc) would help with files of unsuspecting users getting deleted. A log entry could also be emitted. I could see a gentle warning on ssh login (minimal, one or two lines) and desktop notification (for desktop only users who never see the terminal) be helpful. A smarter implementation could perhaps only warn if dirs/files that are going to be deleted are not systemd generated random items. This does not fix issues with applications depending on stuff being there long term; yet again nothing's perfect in software
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