I have a vehicle that's basically a BMW, which has excellent navigation integration with a HUD. Recently, they announced that my vehicle would receive map and software updates, for basically as long as the included modem was functional.

My vehicle doesn't support the carplay to hud stuff, but that's okay. The thing is... when my car stops getting map and traffic updates, I will still be able to switch to carplay for at least the command screen presenting information. I intend on keeping this vehicle for a long time, so that's important to me.

On top of that, carplay offers better bitrate than bluetooth.

For people that wish to keep a vehicle for a long time, carplay/android auto isn't just a convenience anymore. With the increased integration of headunits, aftermarket becomes a tougher sell.