Not sure when the switchover happened, but IIRC I started out with SDL2 on Homebrew and recently got this compatbility shim instead when it updated: https://github.com/libsdl-org/sdl2-compat

I don't have an extremely high opinion of sdl2-compat specifically because my SDL2-based projects have had several bizarre bug reports which originated in downstream packages presuming they could use this "compatibility layer" instead of the actual dependency I develop and test against.