They feel like they 'cost' too much as form traits, and take away from the racial characteristics, for something that seems like it would fit better as a society trait.
As society traits, they could lean further into an emphasis for favoring that terrain, and also there could be one for each affinity, which would fit. They could all grant some stability and a resource for each province you control of that terrain type, which would echo back to previous AoW races having preferences for certain terrain.
For example, what if each one granted +5 stability per province with the preferred terrain in it (effectively negating the natural stability loss from acquiring provinces), and then gave some resource associated with the affinity, on top of granting the existing benefits for adaptations?
Order: Plains Adaptation (Gold)
Chaos: Desolate Adaptation (Draft)
Nature: Forest Adaptation (Food)
Astral: Desert Adaptation (Mana)
Materium: Underground Adaptation (Production)
Shadow: Arctic Adaptation (Knowledge)