Dtango it's both an issue of physics being wrong as illustrated with how this planes flies. You mention only in deep stalls, but this is not a deep stall. This is in the middle of the prime manuvering envelope. As you can see on the film posted a page back and in my film and in other examples, the behavior is abnormal.
It's not that this is only at 50mph where you really force the plane into a tail slide by stalling nose high, nor is it only at 600mph where you dove straight down from 45000 feet to get fast enough to experience it. It's happening at speeds and moments quite normal to almost every plane in the game.
I don't recall a good explanation of the criteria used to "fix" the mossie being brought up either. How, exactly, was this fixed other than a lot of people doing a lot of checking and finding "this shouldn't be this way" ?
What's the established precedent required in this matter? Because I don't recall a level of doubt for the mossie being as much as demonstrated here.
As an aside:
I, personally, am not as attached to the CoG issue as just to the notion there IS an issue. So many things are all put into a flight model I don't know them all but I put forth it could be one thing or several, that end up with abnormal behavior. The end result is "broken," be it caused by CoG or something else. I'm all for "close" and I'm all for "good enough given the work required," but with the 152 it's an issue needing fixing.