The things with some modern jet designs is that they are inherently unstable. And it's only thanks to computer-aided flight surfaces that any human pilot (even a skilled one) can fly them at all. Without the computer-aided flight surfaces, the aircraft would need to be redesigned for better control that that greater stability would take away from the aircraft's fighting performance.

My opinion is that if TopGun allows them, then they are just part of the hobby and there's no sense arguing about it. I just don't (and wouldn't) use them on my WWI models, mostly because I'm just too cheap and lazy.