Warcraft 3 originally supported 12 players but later expanded to allow 12v12 matches, increasing the total player count to 24. Age of Empires II has long been capped at 8 players. Why not expand AoE2 to support 16-player (8v8) or 24-player (12v12) matches? It would open up exciting possibilities for massive team games, custom scenarios, and large-scale multiplayer battles.
If performance is a concern (especially for ranked), the game could auto-limit graphical assets like textures and models to classic 2000s-era fidelity when more than 8 players are present. This would maintain performance while unlocking epic-scale matches for the entire player base without limiting it for a select few.
Edit: Also, consider the population limits: 500 population for an 8-player game equates to about 4,000 units total, while 200 population for 16 players results in approximately 3,200 units. Functionally, the game already supports the population for larger player counts.