At 400+hp, What kills A904s?

That guy is so out of touch he doesn't even realize that most if not all of the stock and super stock mopar racers out there are either running a 904 or a 727 case with modified to work 904 internals in them but I don't know why i'm wasting my breath actually when once he made the 400 horsepower comment about 904's that pretty much closed the case for me with him.
Another racer thinking street cars should run race parts....WHY??? I think I'll call it "904 Derangement Syndrome"...There are a lot of daily drivers on here that don't need to be advised to spend $2k on a 904 tranny when a 727 will work better and more reliable for them at one tenth the cost.