I think AOE4 would do better if it promoted more team games and team tournaments, rather than 1v1. Multiplayer games nowadays are all about team matches!
Finally Team games!! I play mostly 2v2 / 3v3 on the ladder.. I love 1v1 as well but I like playing with friends.. there isn't much content on best tactics etc. for team games so I would love to see some more of this type of game play :)
One thing I really enjoy about team game content is they are forced to communicate with eachother on the fly about their plans and I feel it gives good insight into how they see the game and their thought process
Love seeing top gamers play as teammates and also vs one another - although you are all competitors in tournaments etc, it's cool to see the team player aspect and friendly competition between you all!