A) This breaks all sorts of lore and is just dumb. The whole idea behind the Xenomorph is that is reproduces through the violation of other species. It's supposed to be terrifying and puts haste on the victims to see if they can't remove the egg.
B) There's very little annoyance as is dealing with captives. The people who complain about this can't keep their attention on something for more than 5 seconds without getting bored, wigging out or screwing it up through incompetence.