OP's point was that the failing of the Trashcan Mac Pro was that it was non-modular design that user's couldn't upgrade and (apparently) Apple couldn't refresh.

OP's point was that the failing of the Trashcan Mac Pro was that it was non-modular design that user's couldn't upgrade and (apparently) Apple couldn't refresh. Maybe there is the thermal envelope in this design to support a more frequent refresh rate, but this still doesn't address the fundamental "pro" need to be able to mix and match or upgrade core components like the display, RAM, GPU, and storage.