>>12080204
Problem with Sega's 3D arcade boards is that they were very "deep and wide". They had several individual boards, with a massive amount of custom chips. See picrel, that's the Model 1 hardware. You would have to blob shit together, and cut bits off, which risks ending up badly (the Genesis, itself originating from the System 16 board, was a victim of cutting too much shit off).
By contrast, the 3DO hardware was extremely simple: 1x CPU, 1x GPU, 1x multifunctional DSP.