From elsewhere in the thread, some hard numbers on the topic. https://formulae.brew.sh/analytics/homebrew-os-arch-ci/30d/

Intel homebrew is larger than Linuxbrew, yet I think it'd be shocking if they dropped support for Linuxbrew.

Old machines still work. They're still deeply useful. I'm still using daily an Intel Macbook with homebrew on it. When I no longer use it daily in some years more, it'll still make a perfect server.