Interesting discussion, and while this has got way too philosophical for me, let me make a small offering.......
Space is what exists between you and me, and Earth and the Moon. If space did not exist, then everything would be together and we would be as we were before the BB.
Time exists to stop everything from happening at the same instant. If there was no time, we wouldn't be here and the same applies that we would be as we were before the BB.
Here I submit the following.....
"The views of space and time which I wish to lay before you have sprung from the soil of experimental physics, and therein lies their strength. They are radical. Henceforth space by itself, and time by itself, are doomed to fade away into mere shadows, and only a kind of union of the two will preserve an independent reality".
— Hermann Minkowski,
Which in my opinion tells me that spacetime is simply the framework against which we locate events an describe them in terms of length. breadth, height and time. Spacetime is also defined by the following facts. [1] the speed of light is invariant. [2] Intervals of space and time, vary according to different frames of references, but spacetime is invariant.[3] Gravity is the geometrical warping/mis-shaping of spacetime in the presence of mass/energy.
All are real as I see it, space, time, spacetime, despite not being physical.