My only experience with Nix was one job, where we hired a new guy who had just done his PHD in Computer Science but never written production code.

Someone on the team was mentioning that our build/deploy pipeline was a pain in the butt, and it would really be nice to have a proper CI process implemented.

PHD spoke up saying he could help with that, and then spent the next three months wrestling with Nix. I left the company before I saw how long it actually took him, though.

I saw enough to realize it would likely never be worth my time to use. Sorry Nix.