With an unlimited data plan, I stream Tidal at full resolution on my phone and use Bluetooth to control and listen to in in my Acura RDX. On the interstates I've never had a bandwidth issue. In areas of more spotty coverage I just choose from a few playlists and several albums that I keep downloaded to the phone.
The "Acura Premium Sound System" is OK...but only OK. Very nice sound overall except tor a god-awful peak that makes some percussion sounds loud as hell...almost drowning out other frequencies. At medium to low volumes it's not too bad, but turn it up loud and you find yourself gritting your teeth at those moments.