I experimented with a version of this: https://github.com/mathiasbynens/dotfiles. It worked ok. Still had a few things I had to tweak, but if you have a few things you want to keep it's easy. I basically only use a brewfile + a shell script to set a few defaults and some configs for iterm + kitty that I keep in my personal repo. Makes the most repetitive bits a lot easier. The MAS homebrew stuff didn't work too well when I migrated machines so I still had to install some stuff by hand.