Niether do I. And I'm better than the average bear at such higher math, and have an MS in Electronics Engineering. This is not easy stuff!.
It would help if one could get the mathematical physicists to speak English, now and again. At work we had an ABD (All but dissertation) from one of the big name schools. He didn't seem any brighter than most of the folks, but boy could speak quantum entanglement. Of course no one, save one or two other physicists from other divisions, could understand him.
My brother, Yale Math and Physic Ph.D, could get a start on it, but not me. I can follow the arguments conceptually in many cases, however.
But, he had more 'imagination', I would guess. And maybe a greater ability to communicate to others at their own level.