I worded my reply poorly. I mean to say, Your notion or model of the universe is all downstream of assumptions that redshift can only be related to the Doppler effect (apparently there are a couple types of Doppler effect as the article mentions and links to info relating to "a normal Doppler redshift"). If everything rests on that assumption, it would be something to scrutinize if more and more observed astronomical data continues to pour in contradicting the big bang or expanding universe.
Separating "space itself" from the objects that are governed by universal laws is like saying there could be a north pole without a planet such as Earth. Take away Earth, you have no north pole. Take away objects in motion, you have no basis for talking about spacetime. That's just my intuition, but it seems to point to a gap in explanations, at least from science popularizers.
Separating "space itself" from the objects that are governed by universal laws is like saying there could be a north pole without a planet such as Earth. Take away Earth, you have no north pole. Take away objects in motion, you have no basis for talking about spacetime. That's just my intuition, but it seems to point to a gap in explanations, at least from science popularizers.