Speaking of display stuff, considering you could support 6-bitplanes on ECS, I think EHB was a pretty stupid idea. Why not just have 64 distinct palette entries instead?
Space on the IC, commodore were using a chip technology that was old by the time ECS was used, Denise would have had to have 32 more palette entry registers (each one 12bits wide? IIRC)! That uses up a lot of silicon, much cheaper in silicon to use a trick like EHB.
