Well for starters the LAV based system didn't have the cross country ability of the M2 or M1 chassis based system, and the M113 chassis based system couldn't keep up.
It was one of the many problems that the US Army faced in the 1980s. It was a time when the military was expanding, but at the same time they were trying to keep the number of items in the inventory down to bare bones as much as possible. It is part of the reason why the Army never adopted the LAV-25 with the M2/M3 and M1 family were just being fielded.
Looking at the Isreali Defense Forces using their Main Battle Tank as a base for their new APC, is one of few countries to go this way. So having Diana based on the M1 chassis isn't too far fetch.
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