I don't think we've seen a single technology advance since 2015 that has been necessary. But, of course, graphically it's somewhat jarring ("waiter, there are not enough gold flecks in my caviar") that we have these beautiful, almost photo-realistic environments, and then a grenade tossed into an office always breaks the computer screens in exactly the same way, or a warhammer swung against a wooden door always knocks out a chunk of exactly the same shape, or smacking my Ferrari into a light post always results in exactly the same bumper deformation, or driving tanks across farmfields merely results in track decals appearing on the mud.