I agree we don’t need the equations to understand these things, but if they predict/describe known phenomena, it’s confirms the understanding, and I don’t have the math to double check what he’s saying rigorously, His claim is this isn’t just theory and philosophy but that it’s rigorous because the equations bear it out.

Seems A LOT has been surpassed. I used to love physics when I was young, but was dissuaded from really getting into it because it was presented as boring and only possible to make incremental progress in some uselessly specialized aspect. Told my wife today that within our daughter’s lifetime (and hopefully ours), think we will have unimaginable technological advancement — 1000-years worth.