I’m told that “blown” wallpaper is quite a good insulator - considering you have to put the stuff on anyway you might as well.
Anything that adds insulation is helpful. I’ve also heard of vacuum beads(like tiny thermos bottles)that can be added to paint. It seems to be a local vs global problem. An insulation project at $3000 is too much for the local homeowner to handle financially and yet states have weatherization programs already in place, what’s lacking is political leadership by pols in big oil’s pocket(vested interests).