There is an open pull request: tree-wide: rename nixos-rebuild to nixos-config by zimbatm · Pull Request #100578 · NixOS/nixpkgs · GitHub to rename the nixos-rebuild command with a comment at the end if it should just be nixos. So some people are thinking similarly to you. I personally would support this especially with all the UX improvements that have been/are being made to the nix command as well this might be a nice follow up.
Also great to see the generations UX improvement, that was pretty confusing for me when I first started using NixOS, so much appreciated.