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I think of it as a 2d cross section of the experiment (it’s happening in every direction possible tangent to the ball), which necessarily breaks into a third dimension. In our 3-spatial-dimension reality that’s the best we can do.
Yes, but the smaller object is dragged into the valley formed by a heavier object due to gravity (of the earth), not due to following the curvature of the blanket.
Sure but it is still a cross-section of what it is — something with a mass of that bowling ball being gravitationally attracted to something the mass of Earth. The blanket is a demonstration of what spacetime is doing (how it’s being warped) by the gravitational attraction. It so happens that you can also sort of demonstrate how another object can be influenced by the bowling ball’s gravity as it’s being gravitationally attracted by something else (like how a small object would be attracted to the moon which is still being attracted to Earth). Given that nothing can really ever be gravitationally unbound, I think it’s a fine demonstration. I wonder if you’re expecting it would demonstrate something it isn’t demonstrating (like how an object in isolation would influence some other object in isolation).