But how does that help if the service manager says, "Sure, we'll take care of you. No problem.", and then in six months or a year or three that service manager is no longer at that location and a different service manager is, and the new service manager wants nothing to do with the agreement the original service manager made? Or even worse, six months after the conversation above, the same service manager says, "I'm sorry, but word came down from corporate that we just can't do this any longer."
In other threads you've been a proponent for getting everything in writing, and that if it isn't in a binding contract it means nothing. To suggest to someone considering purchasing a car to accept anything other than a binding contract from Tesla seems counter-productive.