That's a technical detail which probably one of the core developers might have a better answer (I don't use a Mac and am not aware of how Apple Silicon Builds generally work).
As to dumping 3.3 and solely relying on 3.8 (not 3.9), I don't think the developers think it worthwhile to dump an entire package ecosystem built in the last 10 years just for a native build.
As to dumping 3.3 and solely relying on 3.8 (not 3.9), I don't think the developers think it worthwhile to dump an entire package ecosystem built in the last 10 years just for a native build.