Now I'm going to be thinking about Marlon Brando as, say, Coriolanus all day. You're right: he should have done more Shakespeare (on film), and he could have tacked the plays considered more difficult and problematic and changed the way we see them now.

Possibly he did Shakespeare on stage and of course we can't see those...? I'm unfamiliar with his career.

Tangentially, this reminds one how evanescent stage performances are, as one feels when reading a reviewer like Andrew Porter, who appears to have vividly visionary and encyclopedic memories of all the operas he's ever seen, makes me envious; only a few minds can be so well-stocked with performances.