In avoiding the morass of stupid patent rulings that allow manufacturers to camp on an ISA.

There is no reason that anyone shouldn't be able to take someone's databook for a processor and produce a legal work alike. But since we can't do that.

The whole industry is forced to create a new ISA for the sole purpose of saying it is ok to produce work-a-likes.

Cutting edge, but in legal maneuvers.

Also: not an architecture, an instruction set.