You have a point.
But that makes Einstein's achievement all the more astonishing.
He had determined the structure of space-time during an era when atomic structure and the quantum was only poorly understood.
The electron was discovered in 1897, the proton in 1920, and the neutron in 1932. And they still haven't cleared up all the confusion and all the loose ends, not to mention the zoo of new particles which have turned up since.
Quantum theory evolved in fits and starts, over years. General Relativity was born fully formed, complete, with all the loose ends tied up. Even if it is overthrown tomorrow by something new, it still has been as complete, and consistent, and as practically useful as Newtonian physics.
Uncle Albert Kicked ASS!