The way egg morphing works makes the Alien less productive the way I see it. It's a really creepy concept that I wish they went into a little more, but having the alien turn a person into an egg then have another person be impregnated to die just seems like to much to reproduce. Cocconing a person then having a queen lay eggs is more productive since the alien could itself turn into a queen. Egg morphing could be a solution when the alien is all alone though like in the movie Alien and is not sure if transforming into a queen is the safest idea.
Like SM, I've been saying for years that the two methods are not
mutually exclusive: Egg transformation could be done to create
a Queen in an emergency situation. The result then allows for normal reproduction. Presumably, in 'Alien
', the creature was hedging its bets and creating two, just in case one had been killed during the vulnerable implantation.
I used to like the idea of any adult being able to become one. It was realised well in Perry's adaptation of the first graphic novel, in prose. But ever since 'Alien 3
', we know that specialised facehuggers impregnate a host with a Queen. If any adult could become one, there'd be no biological reason for that. So, really, this goes all the way back to 'Alien 3
... If it hadn't been for that, the 'adult-becomes-Queen' theory could still stand (and transforming hosts into eggs would be seen as a preliminary in-between stage of its development).