I suspect you're linking to this without having read it recently. This section now explains that there used to be problems on macOS and that they're now resolved + some optional extra information about what the installer is doing. And to be fair, the mac installation issue was quite bad for a few years.
You may be speaking from the perspective of using Linux because this here is some "you gotta be kidding me": https://nix.dev/manual/nix/2.18/installation/installing-bina...