Thanks everyone for this good information. I have long contended that there was no "hard" reset for the exact same reasons, including having consulted with every Tesla Tech I have come in contact with. It is always funny when someone like
@Duke-U promises to return with content and is never heard from again.
I was really impressed in this Troll happy environment how few people came to this thread to disagree. Perhaps it didn't garner enough eyeballs, as it was also not visited by authoritative rooted figures who could post log files showing the steps of a reset.
Interesting to hear about the streaming services cloud data. I know they no longer give out your account info so you can access Tune-In on your home computer, but I also had a tech offer to reset my car to Factory to RESOLVE a Tune-In issue. I had accidentally hit the Thumbs Down button for the song Tesla Girls, I was so excited to hear it I stabbed at pressing the Thumbs Up. If you hit Thumbs Down you will NEVER hear that song again. Yikes!
He said that doing a reset to Factory will cause the account number to autogenerate a NEW account number, so you would lose all your saved songs. But I have only heard the one tech say that, could just be more VooDoo.