I agree. I think that's why nix-os is getting so popular these days.
I love the idea of declarative system builds even beyond just reproducability. The idea that you can essentially make your own distro without much difficulty is really cool.
Plus all the benefits of roll backs, light backups, etc.
Plus if you can dig deep enough you can craft a system that never breaks by pinning certain versions.
One of these days I want to check it out. As well as LFS. Oh but for the want of time.