My experience (as a user) is that GTK on macOS is functional at best, and I find it an unpleasant experience, so macOS is definitely not ideal for that. No experience with Rust, but it isn't the path the tools expect, for sure. I've never had a problem with PATH not working, maybe the new shell in Big Sur is mostly-but-not-quite like bash? You could try changing your shell to bash, if you haven't already.
If you really want an apt-get (never used pacman) kind of everything-repository experience, though, you're going to be disappointed on any system that doesn't prioritize a centralized repository of software. In practice, this eliminates a commercial OS, and probably commercial software, since there's no effective way to get a central repository. The App Store is the closest, but then you get people complaining you're the gatekeeper, or you get a free-for-all like Google Play. I think Linux manages only because the number of people that use it are small enough that bad actors go elsewhere.
If you really want an apt-get (never used pacman) kind of everything-repository experience, though, you're going to be disappointed on any system that doesn't prioritize a centralized repository of software. In practice, this eliminates a commercial OS, and probably commercial software, since there's no effective way to get a central repository. The App Store is the closest, but then you get people complaining you're the gatekeeper, or you get a free-for-all like Google Play. I think Linux manages only because the number of people that use it are small enough that bad actors go elsewhere.