I'm sure the answer could be found in this repo somewhere but its above my head- does aoe2 DE rely mostly on p2p for multiplayer? I assume it does and the regional servers are just used for matchmaking, and all the actual game logic is running on the clients. I base that on the fact that map hacks are possible and that one player lagging lags the game for everyone, but there are often conflicting claims when it's bro…
Given this, I suspect the server is used as a central source of truth between the clients where all game data goes through the server, with all the calculations still being done client-side.