I dislike rule 3, specifically because you don't need to constantly develop plot. Lets take Half Life 2, early on it is rather plot heavy to get you on your way but then after that you're tossed in a makeshift boat for a long stretch of time without any real plot advancement. This happens later on with a dune buggy as well. Despite those long stretches without plot, HL2 is still one of the finest game stories I've experienced.

EDIT- Also I think proposed rule 2 is already covered by the actual rule 2.