Yeah, that was a massive fail on MP but Berry is just like the majority of the tour (and amateurs too!) that have stronger forehands than backhands. I think he might be better suited to go exclusively ohbh than to try “switch hitting” from one to two hands, particularly when rushed like that MP. He had several points he earned with solid slicing and lobbing so he can definitely lose that left hand, kinda like Wilander adapting mid-career to hitting a lot of ohbhs.
Paire is about the only pro I can say I’ve often seen run around his FH to hit a BH, the antithesis of a lot of plus-one players like Matteo. Before Berry got so prominent it was Sock that always got major flak for his non-existent BH. He just rarely got the chance to show off his fail vs the Big Four.