I just told friends in Oregon obsessed with seeing Platt (and willing to spend a fortune) that the show itself will have such a long life, most people will not see Platt, yet still have the Evan experience. As was true of HAMILTON. Most people will not have seen the OBC. Stars, and especially show-created stars, are important. But the shows are artistic creations independent of them. I can't comment on the current understudy. But eventually "Dear Evan Hansen" will have a leading man who gives a performance in some ways comparable to Platt's. It will happen. It may be this actor covering the part, growing further in the role, or someone yet to be found, excuse the reference. This will be a long-running show, and after Platt's departure, the show will become the event.
"I'm a comedian, but in my spare time, things bother me." Garry Shandling