Why are there so little ass Ground Type specialists in the game, and why only two of them have actual theming with “Ground”?

Is it that hard to come up with ideas that don’t get biased with “Rock” or “Grass”?
>Monster truck (equivalent) rally Owner
>Real Estate Agent
>Adventurer / Foot Traveler
>Builder / Architect
>Dirtbag

Archeologists should be more related with ground over rock.