It was a different time - memory/CPU speed trade-offs were very different - we saw RISC once we were able to move cache on-chip (or very very close) - but at that point CISC made sense and the 432 pushed CISC to the extreme.

IMHO the x86 won out (an d is still with us) because of all the CISCs of its time it was the closest to RISC when memory started to get a lot faster (almost all instructions make at most 1 memory access, few esoteric memory operations etc)