2. We want the game to be believable. Fair enough. But, again, that level of believability is really subjective. And it gets rather frustrating when people will believe 6 impossible things, but, man, that's 7th. That's just too much. And the counter argument is, "well, you don't have a problem with these other six things, so, howzabout you let this one go too?" But, nope, we're going to use that "it's not realistic" as a huge bludgeoning tool to try to justify personal preferences as some sort of objective criticism.
These two issues are always pulling in different directions.