Horse Archer units predate Stirrup tech. I have set up, as best I can, a "leapfrog" effect with the heavy horse and the light horse units, so that the horse units aren't all concentrated on one tech. In this case, Horseman upgrades to Horse Archer before Chariot upgrades to Heavy Horseman. AND has multiple horse lines compared to just one in BTS, so I used the Horse Archer to fill in the light-horse/Classical Era niche. Filling in unit rosters isn't easy, so I would prefer to use whatever is already available. Given their niche, Horse Archers don't need a metal requirement.
I'm not going to make Elephant units into just a novelty. I like to support conceptual "what-ifs" if I can and if they fit into an existing line, and this is one of them. I hate the idea of "traps" built into the game.
I'm not going to make Elephant units into just a novelty. I like to support conceptual "what-ifs" if I can and if they fit into an existing line, and this is one of them. I hate the idea of "traps" built into the game.