yep. 4mb single block would be better for everyone..
but the other thing is that the hype about a compromise of 2mb+segwit.. was released on the 1st of april...
so although 4mb block where native and segwit can co-mingle in one merkle block(no block within block) would be better
im taking a pinch of salt as to if 'core' would actually really agree to code such a version of even 2mb+segwit for people to download.