The problem is finding the bugs. There are bugs that creep into the code that are of such a complex nature that we may simply never see it. We simply may not think to try casting reverse gravity while standing on our heads to see if we will actually land on our feet. I realize that there could be more if time allowed. I think there are a few things that I should make clear.
Realism exists in all games.
Laws and rules define reality. Ergo, games, by standard definition, define a limited reality. The question isn't whether there's reality in fantasy RPGs. The question is what sort of reality do we want defined. People who died there previously were removed, the area was cleaned up, and the trap was reset.