Excellent observation, djf!
TY!!
I’m not sure that I actually buy the idea that there is something radically different in Einsteins work as opposed to Newtonian principles.
If you take Newtons stuff, and you toss in the Lorentz equations, you basically end up with relativity.
I seem to recall that Einstein himself was quoted as saying that Hilbert was the most brilliant mind he had ever encountered.