The "master class" scene in Tár reminded me of the time my undergrad Intro to Playwriting class got a visit from Edward Albee. Edward Albee! In my little class! We were invited to think of what advice we wanted from him.
No one dared, so I said I'd been writing short stories and poetry as long as I could write, but I was finding plays a challenge. What did he think was the difference in craft?
He said, "You probably aren't smart enough. It's difficult." Shrug.