Galaxies tell about things that CMB cannot tell.

"The SphereX (Spectro-Photometer for the History of the Universe, Epoch of Reionization and Ices Explorer) mission, slated for launch on February 28. 2025, is designed to map out hundreds of millions of galaxies over the entire sky in an attempt to measure the large-scale structure of the Universe, throughout cosmic time, to better precision than ever before. It has the potential to teach us lessons about our early Universe, cosmically, that even the CMB cannot reveal." (ScitechDaily, How mapping galaxies can teach us what the CMB can’t)

New tools map galaxies. They also bring information that the cosmic microwave background CMB cannot give. Each radiation type from radio waves through infrared, and visible light to X-rays and deepest gamma-rays brings its own, kind of information. 

The cosmic microwave background, CMB is only one information source for things like the Big Bang and the young universe. The CMB mapping can give information about the beginning of entropy. The space that formed in the mass made the entropy possible. 

And entropy still grows in modern days. When entropy already exists and it's large and powerful its growth is harder to see than in the thick systems. When the system's density decreases that increases entropy. The space in the system that allows particles and superstrings to oscillate stronger and vaporize faster, that thing increases the distance between particles and objects. 

During that process, those particles also lose their mass. But then we must realize that CMB is only one data source for the complicated structure called the Universe. The universe is the largest known quantum system. 

The information that the galaxies can give tells about things like dark matter. The dark matter interaction is purely gravitational. Or maybe there are some other interactions with hypothetical weakly interacting massive particles, WIMPs, and other particles or radiation. But the cosmic background can cover that reflection below it.   

"The quantum fluctuations inherent to space, stretched across the Universe during cosmic inflation, gave rise to the density fluctuations imprinted in the cosmic microwave background, which in turn gave rise to the stars, galaxies, and other large-scale structures in the Universe today. This is the best picture we have of how the entire Universe behaves, where inflation precedes and sets up the Big Bang. Unfortunately, we can only access the information contained inside our cosmic horizon, which is all part of the same fraction of one region where inflation ended some 13.8 billion years ago." (BigThink, How mapping galaxies can teach us what the CMB can’t)

And maybe. Those hypothetical WIMP particles are some kind of excitons. Exciton is the quasiparticle where the electron starts to orbit an electron-hole.  The exciton forms when an electron jumps out from its orbital. That thing leaves an electron-hole that another electron tries to fill. The Pauli Exclusion principle means. That there cannot be two identical fermions in the same quantum system. That's why another electron cannot fill that hole. And when it starts to orbit the hole, it denies the electron-hole fill. 

There is the possibility that also other particles than electrons like quarks can form quasiparticles that are like electron holes that electron orbits. If some boson like gluon or quark makes a hole in the atom or outside the atom and starts to orbit a similar hole, it could explain why we cannot see those particles. So, maybe the gluon or quark can create the hole that it starts to orbit. 

Things like the cosmic web cause the idea that maybe those hypothetical WIMPs can make some kind of chains. The model is that those holes that quark or (maybe) gluon orbits can make the chains. The chain of those holes can be very long. And that can make a model, that the WIMP can be the small primordial black hole that formed in the young universe, or maybe supernova explosions and relativistic jets of other black holes can form those things. 

"Frenkel exciton, bound electron-hole pair where the hole is localized at a position in the crystal represented by black dots" (Wikipedia, Exciton)

Another idea is this. The black hole can be like a giant exciton. The event horizon is the point. Where escaping velocity reaches the speed of light can trap the particles and EM fields. Those fields can form a similar situation. That electrons form when they start to form an exciton. 

The orbiting particles and electromagnetic fields close the hole that we call a black hole in the middle of it. The black hole is the whirl. The particles pump energy to the whirl that prevents the outside fields from filling the black hole. When an object rises black hole its energy level rises. But the black hole is "black" because its gravity is so strong. A black hole is like a tunnel through time. The question is what makes energy move that way, that it pulls particles with it into the black hole's sink? 

We can say that a black hole is a tunnel that the quantum whirl orbits. The energy level in that tunnel is lower than at whirl around it. The fast-moving energy field that travels in that channel denies the energy travel in it from the whirl around it. Or that energy takes the side-coming energy with it so fast that there is a pulling effect. 

Or, otherwise saying the center of a black hole is a lower energy level than its barriers. That means the black hole is like a chimney that pulls energy through it. The lower energy center in the whirl pulls material into it. Or it makes energy fields travel to the center of the black hole. And that pulls particles with it. The black hole turns smaller and smaller because of the Universe's expansion. 

 https://bigthink.com/starts-with-a-bang/mapping-galaxies-teach-what-cmb-cant/

https://en.wikipedia.org/wiki/Exciton