For a while (a decade+), I was running CentOS on my servers on the same assumption of long time stability and ensuing peace of mind. Then I figured that over such durations, the ecosystem drift becomes significant and keeping applications up to date and running on top of the OS becomes an increasing challenge (with the more "infrastructure" packages like glibc, python/Apache combos, GCC, ... slowly becoming incompatible with the latest applicative stack).

Then I figured that version upgrades were miserable, not just because I had painted myself in a weird corner with ungodly packages mix-ups, but because the upgrade path was always best-effort. I think I gave up during the 6 to 7 transition, as I realised that all I needed was fedora: with yearly or half-yearly updates I have no need to fight the distro's packages: stuff stays current and in working order, major distro upgrades go smoothly, downtime is minimal. I'm not considering going back to any "server distribution" ever.