Do you hear much about the Osage (Oklahoma) or Lumbee (North Carolina)? Probably not, because they are wealthier than the local population from oil and banking/real estate, respectively.
Actually SCOTUS ruled three times that “Treaty Tribes have Rights, all others have mere privileges which can be revoked at any given time”.
Does not matter whether the Tribes are a ‘voting block’ or not. They have Special Rights not granted to others ie Non-Indians - you me black yellow white tan green.
Their Rights are specifically enshrined in the Constitution while ours are just mentioned in a general way - despite claims to the contrary. SCOTUS agrees.
Courts continually rule for the Tribes even to the point of overruling SCOTUS when the plaintiff cannot afford to re-bring the case before SCOTUS. The Special Rights and Special Masters status is not political rather it is a matter of law granted on a case by case basis which usually means always.
If those other tribes are Treaty Tribes, then they fall into the above category, else they are just a body under the BLM jurisdiction. There is a difference.