If gravity isn't a force?

As long as we can keep a rectangular grid, then gravity can be a force, and the general relativity makes that happen. Forces andf ields area mathematical outcome, shortcuts available, so  to speak.

You can prove gravity, by dropping a heavy boulder from a building. But took you a ton of work to get the boulder up there in the first place.  Mass has limited axis of symmetry, the more massive, the more likely it will walk a more perfect radius, and give the illusion of gravity. Mass is spectraly bound, it lost spectrum in the furnace, bent inwards, so to speak.   They are simply have thin slices of spectrum if we considered the vacuum as bunch spatial samplers. The will follow a single line of symmetry relative to less bound objects.  Mass is packed vacuum because it is vacuum that lost spectral ability in the furnace, aliased vacuum, and under sampler because it maintains a phase imbalance in it group.