Well part of the point of the character is to show how there's some human dna inside the creature along with the alien dna it started with. They COULD have gone with a snake with a dick or an enormous codpiece but that probably wouldn't have got past the sensor :P
I checked the new Chryssalids in X-COM2. Well they haven't lost there touch: They got dodge, got burrow and are insanely fast now... still, even how badly the dude handled them, his team still managed to wipe them out with plasma weaponry at that point. I guess the new threat is their numbers.