He did do great. But it does matter. His staff was sloppy and careless.
Meanwhile Biden was given notes to read and looked like an old doddering fool who was given notes to read.
Staff wasn’t in a position to tell him, certainly not as he was waving to supporters at the end of his rally. The press sandbagged him as he came down the steps from the platform. His reaction and classy statement was one of his best moments in his presidency. It could have all gone wrong if he heard it at the rally, maybe shouted out from the audience.