AoE2 is essentially a team game.

I'm guessing everybody here has heard of the "raider civs" and other things that were planned for aoe2 but later dropped before released. AoE2 was originally designed for raider civs and builder civs to work together in a team; then when this idea was dropped, the raider civs were given a bunch of boosters to make them equal to other civs. But there is still an underlying idea of different civs working with each other's strengths and weaknesses, as part of a team against another team.

So why is there so much 1v1 on twitch and other streamers? It really limits the full use of the game.