I hear the term looking outside the box thrown around quite a bit. Personally I think if the film makers had done a lot more of that, then we wouldn't be here arguing now. There are so many other "out of the box" opportunities the films makers could have taken to leave their mark on the franchise. What they chose with the regurgitating impregnation, is so the opposite of outside the box thinking. When I see an idea that is outside the box, like Cameron addition of the queen and hive. The word genius immediately comes to mind. When I first read about the mouth to mouth impregnation, all I could think is how fecking dumb that was. My brain was immediately flooded by a cascade of illogical scenarios.
Putting it simply, there is no answer to explain why the queen doesn't retain that ability to adulthood. Its logical that she should, its quicker and more efficient. Why when she reaches her full potential is she suddenly muted?
The truth is, it can never make sense.
Accept it, and move on.
Forget the film ever existed like most have done with Alien: R and AvP.
If you're an Alien fan like me, email fox and beg them for a Cameron / Ridley combo of Alien 5.