I don't think main is as fraught, see the AAVE/historic dialect pronunciation of master "massa" and the baggage therein. Master much more clearly implies the a

I don't think main is as fraught, see the AAVE/historic dialect pronunciation of master "massa" and the baggage therein. Master much more clearly implies the antonyms "slave" "servant" "underling". to me, "main" doesn't have one single strong antonym, it's more contextual, but could be side, alternate, aux, etc.