@3ammo My point is you can literally make up any theory no matter how nonsensical and so long as that theory only has the result of effecting the one way value of c you can not disprove it no more than you can prove c to be symetrical.

I could for example say “Well space just happens to be asymetric by its very nature, there is in fact a special orientation and space itself is deformed in such a way to give these results” If i say that it wouldnt disagree with any evidence we have and is just as plausible as saying space-time is inherently symetric.

take a step back and look at the already existing asymmetry we see in special relativity. If i am on a ship moving away from some other ship, I will always see the clock on the other ship move more slowly than mine. This is true no matter which ship did the accelerating that caused the movement. So from my perspective on the ship it would appear (incorrectly) as if i am in a special frame of reference and/or that there is some prefered orientation to the ship. But we also know the same would be viewed from any other frame of reference and that round-trip the symmetries resolve and we only have a one-way paradox (not unlike our current discussion). The difference is in this case we can actually see an asymmetry, in the case of light that is hidden from us. Its only because the asymmetry resolves itself on round trip that we consider the paradox solved, because it effectively produces consistent results that can be tested.

So why does one asymmetry bother you anymore than the other? There is no framework to suggest to you light has symmetry anymore than there is a framework to tell you it is asymmetric.. so you have no reason to prefer symmetry