@gt2690b I'm not sure which adapter you're talking about. But to your point about plugging in: some newer vehicles feature support for wireless CarPlay and/or wireless Android Auto. I think when most of us are wishing Tesla would implement CP/AA, this is what we really mean (wireless).
Hopefully someone will correct me if I'm wrong here, but doesn't Tesla actually use Open Maps or something like that rather than Google Maps data? Regardless, it does lack reporting/warning of traffic incidents and speed enforcement etc that Waze/Google Maps would open up. Choice is nice, even if you only ever plan to use the Tesla maps/nav.
Yes Spotify is popular. Here's the thing: if you had CarPlay/AndroidAuto, you could just use whatever service(s) you like because they are basically guaranteed to have an iOS/Android app that supports them. What if you like artists that aren't on Spotify? Or maybe you got gifted a subscription (e.g. doesn't Apple give a free trial sub to Apple Music and Apple TV+ with new hardware purchases?) and you want to use that service? Or you have a preference for a different service for whatever reason. If Tesla supported CP/AA, you could just use those without hoping/waiting for Tesla to offer up their own app in their walled garden, or downgrading the experience to Bluetooth audio-streaming.