but there isn't anything physical about the probability cloud, so I think empty space is still the right way to think about it
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It's filled with an electric field that produces forces, attractive and repulsive, the way a spring or pillow produces forces when you push or pull on it. So that's very well physical.
Emptiness is not a property of space , it is of our sensory machine .. I am sure Bats see a lot of stuff in that empty space .. btw , we can't even begin to understand 90 percent of the real stuff that is out there .. dark matter and dark energy .. so our limitations are not only of the so called EMPTY .. it is also about absolutely FULL that we can't perceive ..