That's the nice part, as an admin you are familiar with the complexity and use it for good. As a user, you never have to see it. (And you can even have some freedom for installing apps using flatpack/snap if needed.)

How would you role out the same config to thousands of Arch systems? Sure Valve does it, but I still think that is a "bolted on top" solution. Bootc could be another option though, but Nix solves reproducibility more elegantly, imho. Nix went back and asked "how can this be done better", where many modern solutions took what was already there.