I'd like to see more refinement in core areas of the design (VRMs, etc.) but
Nope.
The already largely overengineered VRMs don't need to be further overengineered.
more "bells and whistles" I can't think what they'd be.
The boards for AM4 show clearly inferiority compared to those for the intel sockets.
What needs to be improved on the AM4 are better I/O - that are M.2 slots, PCIe 4.0 availability, 10/100G LAN, Wireless WiFi and USB.