A draw is different from an incomplete game. You can pretend those things are the same but they're not. If a 1900 ELO chess player is playing a 1400 ELO chess player at a large event, and a fire erupts at the venue, forcing evacuation and destroying the board, a good tournament administrator will not score the game as having happened just the same as when both players trade down to 1 king each. No result will be recorded, because the rules of chess do not define an outcome for that case.
A game's result is defined by its rules, not by what the two players want to mutually agree is the outcome. Mutually agreeing on an outcome is just not something recognized within the universe of the game. That is external to the game. It's like finishing an English crossword puzzle with Chinese characters.
From what I hear, X-wings miniatures has banned draws entirely from their tournaments because players don't like them. You can call it fundamental all you want, but you can't go and draw at their games. You can quit simultaneously and agree with your opponent to do that, and the TO will remove both of you from the tournament. You can run out of time, and they devised a whole bunch of tiebreakers that always resolve that. You can't force the tournament administrator to record that your game was completed and neither player won or lost, the game doesn't have that outcome.