One problem I have with Big Bang theory is that when it became understood that redshift increases proportional to distance in all directions, making us appear to be at the center of the universe, it was changed from an expansion in space, to an expansion of space, because, "spacetime."

Which ignores the central premise of Special Relativity, that the speed of light is constant in all frames. If intergalactic light is being redshifted, it is not constant to intergalactic space. More lightyears, not expanded lightyears.

The "expansion of space" seems to assume the light is a wavy line, that as it's stretched, becomes less wavy. The mathematical model ignores the basic physics of the light.

Two metrics of space are being derived from the same light. One based on its speed and the other based on its spectrum. Given the speed is still being treated as the denominator, otherwise it would be a "tired light" theory, it suggests the original problem is not solved.

We are at the center of our point of view, so an optical effect might be worth considering.

It has been observed that while single spectrum light will only redshift due to recession, multispectrum light "packets" will redshift over distance, as the higher frequencies dissipate faster.

Yet this would mean we are sampling a wave front, not observing individual photons traveling billions of lightyears. Which raises the question of whether quantization is fundamental to light, or is it a function of absorption and measurement.

I'm waiting to see what the James Webb shows of the background radiation. Whether it's evidence of some singular cosmic event, or simply the light of infinite sources, shifted off the visible spectrum. The solution to Olber's paradox.

Fingers crossed on its successful deployment.