He'd likely be very buttmad about the discoveries and progress in quantum mechanics. He was known to argue with the quantum physicists about their models. One of the most famous series of debates, in the physics world, comes from the Bohr-Einstein debates in 1927 (and beyond). Einstein despised the Heisenberg Uncertainty Principle because he believed physics was a known, quantifiable, exact science, yet to be discovered and fully mapped. Indeed, non-locality is frustrating and can seem almost nonsensical. You're not a solid piece of matter, you're the collapse of a wave-form whose sum is the most probabilistic quantum field interacting with other complex quantum fields. Just nonsensical. But it is what "it" is. That's reality. And we've observed this (lol, another topic), proving Bohr's mechanics model to be fairly accurate.