I agree as well. Otherwise they're just a better (and OP) investigator, even with limited interviews, because 3 is just about equal to the number of people an investigator will be able to check on average if you include jailing, roleblocking and dying early on in the game.

On another note, this is a "hybrid" of two existing roles and I think the guidelines specifically state that such roles have a slim chance to be seriously considered to begin with.