Maybe it's the cosmological model that is erroneous.

Basically the Big Bang Theory can't be falsified, as whenever there is a gap between prediction and observation, some enormous new force of nature is assumed and all is good again.

What if your accountant could just write in a figure and call it 'dark money,' whenever he found a gap in the books. It would certainly make his job easier.

Before Inflation, Dark Matter and Dark Energy, the original patch was when they realized that as redshift increases proportional to distance in all directions, it makes us appear to be at the center of this expansion.

So it was changed from an expansion in space, to an expansion of space, because Spacetime!

Which completely ignores the central premise of Relativity, that the speed of light remains a constant in any frame. If intergalactic light is redshifted, it isn't constant to intergalactic space. More lightyears, not stretched lightyears.

Classic Doppler shift isn't expanding space, but increasing distance in stable space. The train moving away doesn't stretch the tracks, just increases the distance along them.

In this case, the speed of light is still the tracks. The metric against which this expansion is presumed to occur.

Remember the evidence for this expansion is the redshift of the very same light, so it seems illogical to say the speed and the spectrum of the same light reference totally different metrics of space.

We are at the center of our point of view, so an optical effect would be the place to look and it has been pointed out that multispectrum light "packets" do redshift over distance, as the higher frequencies dissipate faster, but that would mean we are sampling a wave front, not observing individual point particles of light, that have traveled billions of years.

Which raises the question of where photons are fundamentally discrete, or the smallest measureable units of light that material detectors can absorb.