If the official Devs make it, it should probably be DLC. Mostly because it allows aoe2 to keep being developed.
I can’t see any reason for them to keep putting in resources if they don’t make money from it.
OTOH, if members from the community make it…
I think a regional skin mod could become really popular if steamers start using it. I myself probably would never use it otherwise.
I like the consistency of the game through the civs. All units looking the same makes the game feel like a virtual, real-time chess. And I see AoE as that, a real-time virtual board-like game. Not the kind of game to recreate historical events.
In the same line, I don’t like either the meso monk look. It’s weird for the to be the only (kind of) accurate monk , so either I prefer every monk looking european, or every architecture set having their own monk skin.
Xolotl warrior is just an easter egg. Nothing to take seriously.
PS: I’m fine with an official and optional dlc or mod. Just wouldn’t like it to be the main way to play the game.