Wow. Guess I'm right to stick with Tidal, which does sound like it's actually delivering 1411 Kbps lossless. Although as others have noted above, this is only at its best when I'm stopped, with no road noise, etc.
I turned off Apple Music in Sources. For some reason that action grays out all the other sources' toggles, and we have to turn Apple Music back on to select or deselect the others. I'll just assume that's a bug and not a feature.