Okay, a few more observations:
-With the wireless CarPlay in the BMW, CarPlay was *not* playing any audio from notifications, such as incoming text messages, even if my phone was *not* in vibrate.
-If I plugged in the phone to charge, sounds would *sometimes* play, but not always.
-On the BMW CarPlay, the "blue selection cursor" would always rest on the up arrow to the right of the ETA bar, no matter what I did. On my Genesis, so long as I leave the blue selection cursor on one of the right side buttons that vanish when you don't touch anything (such as the route overview), the cursor disappears along with it.
-Both in Vegas and here in New York, the feature where Maps zooms out during heavy traffic only works on certain highways, and not others. Very weird.