Earlier quoted context omitted.
Homebrew is dog-slow. If this becomes yet another Rust tool that is 10x faster than the one that it replaces: great.
Homebrew is 99% IO-bound and this will be too. Installing (prebuilt) packages doesn't require much logic. If this tool supports parallel downloads, it will be 10x faster than Homebrew, but it won't have anything to do with the language. The issue is finding a hosting provider willing to be DDOS'd for the good of the open-source community.
To be fair I haven't noticed Brew being as tediously slow as Pip. Maybe I just use it way less.