No diagreement here... I think the major issue is discovering how this behaviour "Stops" at the macroscopic level, or most lilkely how it DOESN'T. That said, this isn't a small mystery, it's an absolute kick in the nuts of QM and has been since day one. You see it as a possible answer, and I can't say it isn't, but to me it just seems... incomplete. Do the paths cancel on PAPER, or in real life? If the former, it's a tool in the math, and the latter requires some new theory or interpretation which has not gained sufficient standing to convince the scientific community.All paths seem a lot like LQG (Loop Quantum Gravity). That is a foam of quantized spacetime. So I guess the question is how big is the object (say an electron) relative to the plank spacetime interval? It almost seem like some kind of temperature comes in here to make the position of the electron (if point like) uncertain (diffuse). Or at least a QM zero point energy that makes the electron not point like.
We should keep in mind Feynman's all paths is effectively all paths very close to the classical path far away paths oscillate so fast that they cancel.
Thanks, I wish I was the guy/gal who thought of that question! I would say that we can live safely in the knowledge that barring massive alterations to humanity, we'll die with many myteries still unsolved. I find that oddly comforting.Super good question.
I do not know. It is great to know that there are still areas in physics still to be understood. :)