NixOS is really a profound experience, once you embrace it. I used Arch for ~3 years and ended up reinstalling it maybe 15 times on my desktop alone. Switched to NixOS and I've used the same installation for 3 years, synced with my laptop and server, switching from x11 to Wayland to KDE to GNOME then back again with no problem.

It doesn't feel real sometimes. My dotfiles are modularized, backed up in Github and versioned with UEFI rollback when I update. I might be using this for the rest of my life, now.