“Einstein’s theory of gravitation to figure out how it actually WORKS.”
No, gravity itself if simply described by Newton’s equations.
Einstein complicates things by creating much more complex environments for those equations to happen in (like blackholes).
It’s like asking a watchmaker if they understand how a watch works. And then asking him what would happen if you put a watch in a microwave. He might not be able to answer that one, but that is because the watchmaker doesn’t understand microwaves not that he doesn’t understand watches.
We can observe all sorts of phenomena, and even their effects. But that doesn’t tell us how they really work.
It’s said that ‘no man is an island’. I think that’s true of elemental forces, too.