Gore isn't a an absolute necessity. The pull back from an off screen Miller in the hive shooting at huggers was one of the more artistic shots in AvP. However things bloodily bursting out of people's chests, heads getting chomped, skinned (skun?) people, spines and skulls getting ripped out are all staples of Alien and Predator.
The lack of screen time for Rousseau's burster was laughable and Sebastian's burster went way beyond an insult. It was "Hey! I've got an idea! Let's dump a great steaming turd on one of the most iconic moments in cinema history! Yeah!! High fives all round!!"