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> What I am saying is that we are not allowed to make statements like "In reality, c is anistropic, but whenever we measure it it looks like everything is symmetric". That statement is not forbidden because we have an experiment that contradicts it (we already established that it's compatible with measurements), but because it's logically incompatible with the framework we already chose. Why is logically incompatible? Because it asserts that there is a fundamentally anisotropic physical effect, without a theory behind it. If we decide to put a theory behind it, then that theory will have to conform to the symmetry *because we said so*. If it does, then it will have some isotropic signal.
So we somewhat agree here. I do agree that no one could ever say "in reality one-way c is anisotropic", theory or no theory in not even testable and will not contradict existing theory if true anyway so not even theoretically testable.
What I am saying, which is more important really is that for the exact same reasons you cant say "in reality one-way c is anisotropic" you **also** can not say "in reality one-way c is isotropic", for all the same reasons, there is no theoretical framework you could use to prove it.
So my point all along has been "It is fundamentally unknowable due to the physical laws" and since the theoretical laws are a description of the physical laws it is also unknowable in theory.
So to take my point back another step, not only is the isotropy of one-way c unknowable, but whatever it does in reality (be isotropic or anisotropic) you will never have a way to discern one from the other. It is inherently unfalsifiable. Which is also why the idea that it is isotropic is merely a convention, it makes our math easier and any assumption of its nature gives the same results so we pick the one that is mathematically the easiest to do.
