I think the premade units ATM is pretty scraped, they just designed enough units for the game to run around, but I hope there will be more designed units up near release.

If you notice, the AI will use your designs if you have played pariden, and have designed units (Warg units for example), then next time you meet pariden they will use the same units against you, just goes to say how much we need unit designs in there

I usually design all my units myself, even from day 1 of the game.

Sincerely
~ Kongdej