Yeah, there are clearly only two types of actor and they should both stay in their lanes. The guy who played Batman is a Movie Star so he shouldn't have gotten fat and bald to play Dick Cheney when there are already so many fat bald character actors out there.
First of all, do we know whether or not any fat and bald characters did audition for the role? Maybe the director didn't think they were right. Actors completely transform themselves for roles all the time. Charlize Theron certainly went through an amazing transformation to play Aileen Wournos. Should director Patty Jenkins have waited until she found someone who looked just Aileen Wournos but couldn't act her way out of a paper bag/