This is something that is coming to traditional Linux as well though, with zfs snapshots. I've had it for a long time on FreeBSD. I just snapshot before I do something big.

I see the benefit of declarative configuration as an admin at work where we need to set up many systems the same way. For home desktop use I don't really see the point, I don't think it's a tech that fits perfectly in every scenario. Like most technologies there's usecases where its benefits shine and the drawbacks are irrelevant, and others where it's the opposite.

For example I often come across software that isn't packaged for my OS and I like to just compile them and try them out without having to do the whole packaging routine.