For Roon Arc on Carplay and Android Auto - I would like to agree with the other comments - just adding here for Roon to see these requests for updated features are common across users:
Suggested Roon Arc updates for Carplay and Android Auto:
a) Search function for songs, albums, and artists (this is available via other apps on carplay etc., such as spotify)
b) Integration with Tidal and Qobuz - unclear if the car app is integrated with these services like on the smart phone app? I recently selected an artist to see what albums were listed- and noticed only the albums I owned showed up.
c) Smoother/faster/accurate interface - like others have mentioned- connection via mobile phone can be spotty and in my experience when there is a connection, choosing songs, albums etc., at times is not very smooth or accurate. Something must not be registering when there is lag since the app chooses want songs it wants despite what buttons I push. I have chosen the lowest quality setting - and lag still sometimes occurs.