@Vincent
No, the unrealism happened because some certain developer of JSB planes had a little unrealistic fun with it

And yes, I have in many planes little easter egg like extra crazy stuff. Try the Koenigsadler which has a key to switch in crazy-mode (I don't tell where, it's an easter egg, it want to be searched) and you can fly her stable at FL390 at about mach 0.9. And in another plane is a hidden button that inverts up and down ... okay, yes, I have sometimes a little bit too much fun. Don't take it too serious. Normally, I should have killed you for the attempt to fly a C-5 that high, but then, seriously, who wants to kill friends for trying something crazy in a flightsim?
J.