Good response, bud rap, but a little short one what then.

In the Big Whisper model, the same red shift is used to view the material universe as 'outbound only' (reality is more complex than that). However, instead of 'a singularity spook' the BW model is based on an original setup in which a twist is incorporated. Much the same as a twist is incorporated in a hurricane. As starting point, the eye of the storm is pretty darn calm, but soon after the wall of the eye is the most destructive wind force on the planet.

Same for the materialization process. If the source for matter is really with the wall and not the center, then we should not start counting our eggs with that center of the eye of the storm where butterflies can indeed roam freely. We need to then start much further out than that silly mathematical center. By not thinking linearly (or thinking linearly and recognizing the origin is not found in the center), the Big Whisper explains the materialization process better than the Big Bang LCDM model.

https://fred-rick.medium.com/the-big-whisper-theory-for-dummies-38333ffabe0c

The gold standard is not available for the materialization process, because that process is not repeatable. Still, many scientists pretend they have the gold standard in their work and hog that seat. Silver ideas, such as the Big Whisper model, are rejected out of hand.

I am curious what you suggest instead of that outbound motion for all matter. Do you have a storyline why your proposed outcome ended up being the result?