And I will say yet again: It is possible to play on and still think there is an extremely low chance of winning or drawing, but see no net loss.
People seem to automatically assume that if you play on, it means that your opponent believes you can't win it, or doesn't know his position is lost. What was mentioned in the first paragraph is the possibility nobody considers.
To me, I just don't feel the need to mate my opponent in style, or show him that I can win with underpromotion. I just do the normal things: make queens, get rid of his counterplay, say gg, and be done with it.