Einstein improved the philosophical hypothesis of gravitational physical system from the misfit mechanical olus dubious acting at a distances to the fluidity-laden space time background that has no force. Also he changed the philosophical hypothesis of independency of speed of light towards observers.
Weaknesses still exist but scientists are not motivated to improve them. Instead, they are urged to solve listed problems, some of which are vanity- inspired problems rather than pure.
Physics has stalled in progress or impressionable one as
a field and I think part of the reason is this.