No one has complained about this, but I am having a hard time with the resource levels of mounts. 1 every 3-4 seasons is not sufficient. I would rather get 1 per turn with a limit to the max we can get for each city level. Or just make the Unitstat_Is_Mounted have a trade off in battle against polearms and archers. Archers should be able to lower the Init of a mounted unit with the concussive force of the arrow. Not by much, but focus fire on a unit should slow it to a crawl for the next round. But it should not take 4 of these resources working in concert to train one horse or warg per season. .5 per season would be a reasonable consolation if you are just worried about pony spam. That is a fair concern.
The idea this problem gave me was to have a faction that specializes in training cavalry quality horses. They should get +50% to mounts resource production from a one per faction building. A little of that golden faction difference to sell the game.