Because Jan Wenner hates them and he runs the Hall. The whole thing is Wenner’s baby, acts he likes are in, acts he doesn’t like but doesn’t hate get in eventually so he can pretend to be fair, acts he hates have to wait for him to die.
Yep, rock “history” as written by Jan Wenner and Dick Clark is incredibly short sighted.
About as relevant as Little Steven lumping a lot of non-garge or even rock into his “Underground Garage” weekly playlist (Bruce Springsteen manages to get a play every week).