Absolutely and totally, they generally don't change it until errors show and then too late. Quite funny actually. Then they have to come up with a really stupid theory for why the breakage since, heavens to mercy, they cannot possibly blame their own actions. Even funnier..........some of the ideas I heard while at the auto store were beyond belief and worse than that. It must really hurt to have to think and have it make some sense.
The ONLY way I could ever see new fluid hurting a trans would be if someone overfilled it, the new fluid then cavitates clutch packs since air whipped into it and then old clutch piston seal blows out from the repeat hits of air/fluid since air compresses. But once again, that is a cockpit problem and not the fluid. Or maybe someone FORCIBLY flushing to stir up settled trash, again, not a fluid problem in and of itself.