A very well explained post on a complicated subject.

Your referenced paper on the lack of a detected substructure in an electron says the radius of an electron is less than 10^-18 meters.

This is so small and yet an electron somehow goes through both slits in a double slit experiment. Interesting. The simple electron is so easily controlled with electronics, yet the electron is still so full of mysteries as to what it really is.

Quoting them, "The electron is a remarkable particle indeed! The electron's ingredients, if any, must be unbelievably massive, and the electron's incredibly small size still remains undetectable."

Thanks for the interesting post and the great references. Resteemed.