on the flip side Chrysler changed the spec from ATF to motor oil in some of the FWD 5 speeds, durability reasons were given.

ATF is thin, lack of "shock" ability is part of it's problem. As for autos failing for lack of lube, I have rebuilt more than on Torqueflight that had wear issues with bushings. That wasn't teh failure mode, but it was an issue.

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.