Cosmology has regressed to the geocentric perspective of our ancient ancestors.
This post is just an opinion but I feel this must be said by someone to bring attention to the basic problem of perspective.
We are looking at the universe from only one location, Earth. This has never changed over the course of humanity.
The telescope enabled a perspective of a scale for distances beyond the Earth.
By parallax, we can measure planet distances to millions of miles and stellar distances to many light years.
In the 1920's, Cepheid variables became accepted as having a predictable light curve. Using a Cepheid M31 was measured to be a few million light years away.
At such distances, any motion requires many years to observe and measure.
We also discovered in the 1920's, the spectrum of a galaxy had absorption lines that could shift.
The line shift in the spectrum suggests a motion relative to us on Earth.
Unfortunately the Doppler effect is only in the line of sight. It offers no detail of any transverse velocity. This is not a true representation of the object's actual 3-D motion.
The only measurable apparent motion was in the line of sight from Earth and for distant galaxies that motion seemed to be away.
In 1936 Edwin Hubble concluded the shifts in a spectrum were different for galaxies beyond our Local Group.
Light passing through the intergalactic medium, where hydrogen atoms are present at low density, exhibits a hydrogen absorption line red shift accumulating over distance.
This was the original Hubble's Law of red shift to distance. Slipher made the mistake of treating the red shift also as a velocity.
As a result, all distant galaxies were moving away from Earth, and an increasing distance by observation they had an increasing velocity. Cepheids could have broken this link but as distances increase they become too faint to detect.
Since spectra are never published one cannot know when a Cepheid calculated distance is closer than the Hubble distance whether the Cepheid or Hubble distance is published.
Cosmologists perceive everything in linear motion directly away from us.
When cosmologists look at the red shifts I believe they forget there is no galaxy in the universe with a measured transverse velocity, to disturb that geocentric perspective.
If any galaxy at any distance could be found to have any transverse motion, then this will be disturbing simply because then there is a galaxy NOT moving ONLY in line with Earth. That "chaos" would be the "'reality check" which is needed.
unfortunately, it will take many years of observing individual stars to find such a galaxy.
Therefore every distant galaxy has an unknown velocity both in direction and value.
Everything based on the false unidirectional velocity is invalid, like the supposed expansion.
There is another aspect to a perspective of the universe.
I suspect many people lack a realistic perspective of the scale for numbers in this huge universe.
There are 31,536,000 seconds in a year.
There are 9 460 730 472 580 800 metres in a light year.
A mistaken red shift velocity of several thousand km/s will take a very long time to move an observable distance.
A mistaken incredible red shift velocity of z= 1 (moving at the speed of light!) will move only 1 ly in a year.
With galaxies millions of light years away it will take millions of years to see any change in position of any galaxy.
The big bang sounds like everything is zooming away from that event. On the scale of galaxies in the universe, everything takes a very long time to move an observable distance.
The very idea of a defined timeline spanning precisely 13.8 billion years is absolutely absurd.
Not only that, the geocentric view was recognized as naive long ago.
Modern cosmologists are just unable to grasp a realistic perspective (both distance and time) of the huge universe from our view here on Earth.