That wasn't the thrust of the argument, but rather a rather poor example picked out of context. Let me ask you this Hong, say you were playing a fighter and your party is discussing whether or not to continue through the next level of the dungeon/adventure or head back to the surface and rest for the night. The mage responds that he has several grand enchantments left and feels more than willing to continue. The cleric mentions that he has many of his patrons greater blessings left and feels comfortable continuing. Perhaps the warlock simply smiles as fires flair between his finger tips.
But say that you the fighter has run yourself dry, lacking in Dailies, surges, and action points. It is likely that if you continue you will die. How do you handle this? Do you express this out of character knowledge to save your ass or do you charge boldly down because your character has no idea that this is so?