Replicating the physical interfaces does a lot for the quality of the emulation experience. Take, for instance, the C64 maxi: it’s physically a C64 (dimensions closer to a VIC-20, but that’s negligible) and, while the emulation is good, it feels much closer to using a cycle-accurate C64 over a PS/2 keyboard.

I don’t think the potential market for Amiga and ST keyboards for use with MiSTer justifies the investment, but I’d LOVE to see LK-411, Atari ST, Amiga, Sun, Symbolics, and other pre-PC-101 layouts as reasonably priced USB keyboards.