So if someone bumps into you in the hallway and goes "sorry, didn't see you" or "how's it going?" "it's the feds, cheeze it!" you just stare blankly at them for a good 10-15 seconds, while you compose a reply word for word? I'm sorry, as funny as that is to imagine (you realize you're saying you literally "Bioware" real life conversations, right?) I simply don't believe it.
None of your three examples would require it. If I bumped someone, we probably said sorry simultaneously (unless I didn't notice the impact, in which case I would say nothing). How's it going? or things to that effect elicit a stock response from me - "Well enough." - which I offer reflexively out of habit. The third would likely inspire actions, not words.
Sorry, but meaning stems from interpretation, on both sides. If you say something you consider fitting, but everyone else considers pompous, guess what? Your reply was pompous.
That's an absurd standard. If I meant it not to be pompous, then I'm not going to think it was pompous no matter how it was interpreted.
More to the point though, the mere fact that words are themselves arbitrary expressions of ideas that can change with context already throw your theory out the window.
No, it reinforces my theory by introducing unresolved ambiguity. If we allow that words have no meaning in and of themselves, then the only meaning they have is the meaning we assign them, and we can't read each others' minds. Misunderstandings are virtually guaranteed, and we might never know.
If you can't roll with the punches, you're not doing a very good job of inhabiting the mind of the character are you? Roleplaying is playing a role. Nowhere in that description do I see a requirement that you like where that role takes you at all times.
The role shouldn't take me anywhere. I should take it places. The character should have no identity or motives without me creating them.
Congratulations, you've just contradicted yourself. If your concern is the literal meaning of the line why are you talking about intent all of a sudden?
Intent isn't relevant to interpretation (because the listener can never know what it was), but intent informs the speakers choices. I can't choose what the character says without first knowing why he wants to say it. That's the only way I can know whether the line advances his objectives (and thus whether I can choose it without breaking the character.
Rationalizing that after the fact would have staggering computational complexity, as it would need to be consistent with all other previous behaviour.