> Sure, but if you are such a situation, then paying for Operating System is probably cheaper than paying engineering time to fix it.

Yes, that is the entire point of what I said.

> most stuff these days could probably be shoved into a container and thus extremely distro/version agnostic

It depends on if it's an in-house app or managed and built by a 3rd party (may void contract). Also depends on the risk of life/monetary loss if something goes sideways.