Comment by lacker

The biggest thing to me is that video games do not have very many independent objects, compared to reality. Go outside and look at the real world and you will see the ground has little pebbles and bits of mud and all this stuff that gets kicked around. No video game will let you inspect the leaves of plants to look for little bugs, the way reality will. Or for indoor scenes, there is no video game that accurately captures the experience of "picking up a living room with a bunch of toys strewn about".