While I can't answer that, here is a recent submission that goes into why the 68000 wasn't chosen (tldr: they were just too late for the rigorous and therefore

While I can't answer that, here is a recent submission that goes into why the 68000 wasn't chosen (tldr: they were just too late for the rigorous and therefore time-consuming quality assurance program that IBM had imposed on the IBM PC): https://news.ycombinator.com/item?id=14619360 https://news.ycombinator.com/item?id=14619360