Probably this issue has been hashed out many times over the decades, but arguably the security gain isn't a fortunate or incidental benefit of minimizing default enabled services, nor a cheat like weighted dice, it's a very real benefit resulting from an effective, intentional technique. Maybe other OSes should do the same, and then everyone would have that benefit.

The other OSes have other priorities, and that's fine. Embrace that. Yes, most users (and developers) don't want to deal with the compatibility issues. But when you say OpenBSD has few default security holes because they have few default services, that's a complement.