>>16628361
> The speed of light is constant because Maxwell's equations tell us that it's a constant.

This is a map-territory error. Maxwell's equations seek to model classical electrodynamics using the tools of partial differential equations. Maxwell's equations do not prescribe the behavior of EM that they seek to model.

> Moreover, the constant speed of light is then raised to a physical law in special relativity, and the precision tests of SR are numerous.

Again, special relativity is a set of postulates by which we _assume_ the material world operates. Special relativity seeks to model reality, it doesn't prescribe it axiomatically. We assume that the fundaments of physics are constant in all "non-accelerating" (whatever that means) reference frames. We assume that the speed of light in vacuum remains constant for all observers.

These are inferential modeling approaches. They are axioms of a mathematical strategy by which we seek to describe material reality. They aren't something with a priori truths value, and whether they remain consistent matters.

> If the speed of light wasn't constant, it would have been seen by now in some kind of anisotropy in Lorentz invariance. IIRC non have been observed.

I invite you to try something on your computer (to see why you shouldn't take these things at face value). Define a vector field to be:
[math]
V(x,y,z) = \left(3.0\cdot 10^{8}, 3.0\cdot10^{8}, 3.0 \cdot 10^8\right + W(x,y,z)
[/math]
where:
[math]
W(x,y,z) \sim \mathcal{N}(0_3, \sigma^2 I_3), \quad W(x_0, y_0, z_0) \perp W(x,y,z) \forall \left|\left|(x-x_0, y-y_0, z-z_0)\right|\right| > 0
[/math]
with some relatively small [math]\sigma^2[/math].

This field is isotropic despite being nowhere homogenous.

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What's the point of people invoking quantum mechanics in debates when there's absolutely zero consensus on how to interpret quantum…