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EDIT: to partially answer my own question. I see that starting with macOS 10.15 (Catalina), Gnu Emacs was replaced with mg. Catalina was released in October 2019. I don't know anything about Mg but it seems like a neat project.
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Though I don't love Ventura, running Emacs on MacOS has never really been a problem for me. It's also very easy to build Emacs. You can use this shell script if you like: https://github.com/mclear-tools/build-emacs-macos. I also list there a bunch of other build scripts from other users. Just as easy as homebrew really, with a lot more control (e.g. you can build whatever version of Emacs you like, at least back to 22).
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You only need this: https://github.com/d12frosted/homebrew-emacs-plus
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Looks like he uses a thing called uEmacs.
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https://brew.sh/ - there's an entire world of open source software, one command line away!