Very few scientists spend their lives studying anything. Physicists specifically spend their lives extending mathematical equations. IT is always assumed, though not without evidence, that those equations are already fundamentally correct. When a physicist claims to have "proved" something, 90% of the time, he means "the equations balance.
But something in the Standard Model is seriously out of kilter. trying to refine equations in order to extend your understanding doesn't work if the basic model is incorrect.
And gravity is the most incorrect part of the Standard Model. physical matter, light, electromagnetics are all fairly well understood, but Gravity is the problem child. There is no known mechanism for it to work. Every time some physicist thinks "AHA! I HAVE THE ANSWER TO GRAVITY!" he turns out to be very provably wrong.
My personal opinion, and it is only an opinion because I don't have the background to prove anything one way or the other on it, is that LeSage had the right idea, gravity is a pushing mechanism, not a pulling one.