How does devenv help with using an specific version of a package in an easier way than nix (with flakes)?
Does it have any kind of simpler syntax for overlays? Or you are referring to pinning a nixpkgs version?
I'm not really against tools that make it easier to use nix, I think devenv is a nice tool and I like that it doesn't hide nix, the same way I love home-manager and use it all the time.