how to use resources is a choice Arwin, that 1080p means less space for textures and models and less bandwitdh is a fact (and less fillrate, but this change from game to game)
Of course it is, but are you comparing the largest levels in Resistance to, say, a tenniscourt? A football stadium? A basketball court? How many different textures do characters in a sports game require? Both teams have the same uniforms after all. Two tennis players are maybe going to be four in a doubles game, but after that you'll have to stretch using ball-bays to take it much further, or maybe other fringe stuff like audience. It's not like the ball is taking up a lot of resources right there beyond maybe physics calculations ... and those aren't going to be very complex either. How many models do you need in these games? Sure, individual players will take up some space, but it's not really exhausting resources compared to huge buildings with infinite view-distances in something like resistance, with all sorts of aliens, weapons, smoke effects and so on and so forth.
How hard is it to recognise that different games have different resource requirements, and that for some of them 1080p isn't going to be much of a sacrifice?