We’ve spent 4 years watching him fail to heed any advice from any of his advisors, including literally his debate prep advisors. This is all known stuff. We know he tunes out and basically pays no attention during his debate prep, instead preferring to whine about shit.
Buy it: Top I Am Fucking Freezing Shirt
Even if he had made that choice consciously (which he can not do because he has no control over his emotions) it would not have made any discernable difference between any previous debate. This. Is. How. He. Behaves.