This comment is much better than the article, because it tells that some of the complex relations between conceptual entities in physic, could be presented in a

This comment is much better than the article, because it tells that some of the complex relations between conceptual entities in physic, could be presented in a simplified but equivalent way. So it hints that the "problem" presented in the article is only an artifact. Henry Poincaré wrote exactly this in 1902 in "the science and hypothesis" Nous sommes acculés à la définition suivante, qui n'est qu'un aveu d'impuissance : les masses sont des coefficients qu'il est commode d'introduire dans les calculs.[0] I am also happy for the reference to the excellent blog of Matt Strassler [0] https://en.wikipedia.org/wiki/Science_and_Hypothesis https://en.wikipedia.org/wiki/Science_and_Hypothesis