I think it sits in a place similar to where "the ether" used to sit. Similar because lots of ppl take that it is an actual known thing. Dissimilar b/c those who do work around it understand it's more like, as you've found, stuff implied from all we've learned regarding physics to date. Without it the math kinda falls apart.
Then you might ask "well, could the math we use now actually be wrong?" I think the answer to that comes back around to "but the math we do have actually works really well; throwing that out is very hard to do".
Personally I think it needs new naming; calling it anything other than a question adds bias that may end up wasting time.