If the electron is composed of constituent particles bound together by some unknown attraction...
If the measurement accuracy with which we measure the electron magnetic moment was the limit on the electron radius and constituent mass...
Then
The electron's ingredients, if any, must be unbelievably massive, and the electron's incredibly small size still remains undetectable.
Without delving into the math, and just reading the English, I read...
Based on assumptions, and a couple of dubious ifs, subtrons are unbelievable [to them], even though measurement hasn't been possible.
They might know QED better than me, but I think I can read English.
Now,
what if electrons constitute subtrons held together by known forces?
~Paul