It's interesting to consider that entire societies have been built around these concepts. Usually when I see the Implicature thing that has been mentioned here, I often question whether the exact opposite (or something else all together) should be considered first; from there, you can think about whether everyone might be right.

Similarly, with those maxims about communication it's as if everyone is striving for a genuine meaning. However, if you take things to their limit there is nihilism everywhere.

The aliens, asper people, and 3/4's of everyone could just be unaware but also just rejecting the conventional notions of conversation.