Those are good points, Noble100.
I few days ago I was playing Janos Starker Bach Solo Cello Suits on vinyl. My wife walks into the room and we had this conversation:
W: why are you playing this particular record?
Me: because I wanted to know how it sounds with the new speaker cables.
W: oh.
Me: how does it sound?
W: it sounds like he's in the room!
Class D is here to stay. A well designed amp, and any other piece of audio gear in the chain, should just disappear and let the music through.
Judging from the success of companies using OEM class D modules, it seems that the ones that gained the most acceptance design their own input stage, along with other modifications to the amp architecture, perhaps to compensate or correct what they consider deficiencies in the OEM amp topology.