Age of Empires 2 Definitive edition is thriving. I play regularly with a group of friends, and found out this week that several of my colleagues play it too. DE really is AOE2 in its finest form: Fixed netcode, responsiveness, matchmaking, and continuous patches and balance tweaks. It's a 20-year old game that gets monthly patches, and is active enough to match you to opponent[s] in minutes. Compared to SC2, I miss t…
AoE 2 DE is a lot of fun, but I do wish they'd allow for 16 players. Comp stomps with a group of friends are limited to 4-5 right now, but there's probably no intrinsic reason they couldn't be higher.
The client (from the original version through DE) runs a single-threaded simulation. That is a big barrier to getting more players or even larger maps (it used to be that ludakris size was unplayable before DE/UserPatch optimizations). Given how many players can't even clear the multiplayer performance benchmark without dramatically reducing quality settings, I'm not sure they'll bump up the player cap unless they decide to re-architect a good part of the engine internals.