Comment by rtpg

The sort of real thing is that it's not just about no-downtime deploys, but also stuff like rolling back smoothly, general continuous deployment or even just generally being able to easily move between versions.

I still think there are lines (I have to begrudgingly accept that downtime for PG upgrades is still basically worth it because the effort to not downtime there is so high but the frequency is so low), and it's a spectrum. But I've found that this particular flavor of tech debt tends to hurt quite a lot even with fairly low activity systems