This thread is one of those cases where you read something and realize you've been completely missing something. I don't monitor these as much as I should

Servers/services? Definitely - take your pick. Timers/jobs, particularly those on my system? Nothing!

With the right 'Wants/Needs/Before/After' laid out, they can be pretty robust/easily forgotten.

I've been lucky in this regard; I spot check systemctl list-timers just to be sure - but they always run