It looks like solutions like these miss the whole point of what Nix is trying to do. Nix comes with the belief: “Unix has some fundamental issues, because it was designed in specific way. If we store things differently it works really well, and we even get those cool properties for free”.
The authors of those projects instead of thinking “this looks interesting, and it is a paradigm shift but it might be worth to to try feel like Linux noob for some time and start thinking a bit differently how the file system is structured to see if this change is really worth it”
Instead it is: “I don’t need to be PhD in Computer Science (whatever that means), here is how I can force this Nix feature or two on traditional Linux, with ansible, bubble gum and some duct tape and make it immutable-ish, which fails sometimes but, hey, it has the same feature on paper.”