re: The case against dark matter

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No! Recall that gravity is an effect, not a thing. Electromagnetism has a carrier of the force, the photon. There is no carrier for gravity.

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That's where the graviton comes in, my friend.

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I recommend Brian Greene's books for you to understand the current view of most scientists views on what spacetime is. You seem to want to understand it based on how classical matter behaves.

Spacetime is what matter and energy of the Universe is expanding into. While we don't know what spacetime is made up of, we know it is something. Something that causes the gravitational effect.

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I understand what you and 99% of contemporary physicists/scientists think there is or think what spacetime is. However, I fail to see any proof of there being anything actually there outside of Einstein's general relativity and "Einstein rings" which their existence can be deduced to a simple phenomena like refraction instead of a citing a theory which reinforces the idea of an abstract "thing" which light and mass travels through like a road in space.

If matter influences spacetime and spacetime influences matter, we should probably define what the hell it actually is in this theory instead of just saying it's the combination of X, Y, Z and when it happens. You can't say something is a thing when it's two relative and abstract constructs thrown together, say it's there and exists, then cite the theory itself as proof that it exists.