I think Tesla is so much like Apple. Both sell a product of debatable quality. Both do their utmost to differentiate from competitors - most visibly by using non-standard charging ports for their respective products. Both had a quirky CEO that gathered a cult-like following. Both are headquartered in the SF Bay Area and have very loyal fans.

My biggest concern as a Tesla stockholder would be that lots of Apple's retention power is due to the walled garden and making everything slightly different so users have hard time switching to competing products.

I don't think Tesla has many such technical obstacles to stop customers from selecting a different brand for their next car. They need to compete by being actually better and successfully maintaining a premium image.