I'm glad you brought up the Sharp! The X68000 definitely belongs in the same pantheon. I will quibble that difference between the PC and the Jay Miner designs

I'm glad you brought up the Sharp! The X68000 definitely belongs in the same pantheon. I will quibble that difference between the PC and the Jay Miner designs is much more than the brilliance of Jay Miner. The early PC design was probably hobbled intentionally by IBM to keep it from cannibalizing their low-end mainframes and workstations. I believe that was part of why Bill G parted ways with them on OS/2: crippled PCs may have had some value to IBM, but none whatsoever to Microsoft!