I would recommend you give it a shot. Nix is not conventional and you will find that the ways you’re used to doing things are arch are done differently on NixOS. It’s not a matter of maturity. It’s a matter of use case. I use it on two systems, but not my main one because there are some things that I don’t want to deal with that NixOS imposes. I encourage you to give it a try and see what you like about it.