I switched from Arch to NixOS around Nov 2023 and manage my systems and my family’s off of one flake. Dotfiles are managed within my flake (if easier), an exception would be Emacs, which I use syncthing between my Nix systems and a work Windows PC with straight.

Discourse, Discord/Matrix, the wiki and various blogs are places to learn from. Documentation is sometimes difficult to splice together, other times very intuitive, but others can help direct you. Just leave some lead time for people to get back to you.

If you can figure out how to do gaming on Arch, you can figure it out on NixOs. Add to you config or flake slowly and back it up somehow before making changes, along with important files. You can always rollback or if you do manage to nuke it (I have twice due to lack of HD memory), reinstall and be up and running in a short time frame as long as you have your config somewhere.

I’ve done more on NixOS in a shorter time than I ever had on Arch, but also learned a lot from Arch which helped. Try it out on an old machine or VM to see what you can do with it. I’ve plateaued at getting a server up and running, and ricing hyprland, but that is due to lack of time and close to zero knowledge.