There is this little game called Age of Wonders 3, and it has this great feature: Beside campaign & the classical skirmish randomly generated maps, it also has scenario maps.
What are scenario maps? Pretty much Siege of Constantinopole. Handcrafted maps either 2vs2, 3vs3 or in this case 3vs1 with a theme behind them. They are essentially like 1 campaign map but played by multiple people competitive.
Age of Empires 2 don’t have such thing except for workshop as far as I can tell. But it would be cool if such a thing existed in the official game. We already have a Siege of Constantinopole map.