There are a lot of things I'd like to see in The Sims 4, but if I can only have one of them, I sorely hope Sims can just move the fuck through each other. Standing around and tapping your foot for 2 hours to wait for someone who moved away from the fridge 4 minutes after you decided they were "in the way" adds absolutely nothing to the game, and a lot of TS3's dumbest errors are because of stupid townies clogging pathways. Come on. Cars already phase through each other and it's weird at first but you get used to it. Having Sims not be able to do the same thing doesn't add 'realism' to the game, just hair-pulling frustration.