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It's not that simple. The problem is that when creating a game in multiplayer, I can't choose a specific opponent; it's only possible after the game is created. And when creating a game, new maps aren't visible at all. Therefore, it doesn't matter if my opponent has the map or not.
The same was true in the 5th installment. If the versions don't match (1.6, 3.0, 3.1, as they were in the 5th game), you couldn't play, or, conversely, custom maps created by players wouldn't be visible. These maps need to be integrated into the game physically, in my opinion, rather than simply by dragging them into the document and settings.