There are basic rules for coming up with these types of product subscriptions:

1. Is it something a large number of customers can't live without?
2. Is it something that costs money to support and continue developing? Subscriptions help defray that cost and loyal users are happy to keep it going.
3. Will the feature be actively used on a regular basis, going forward?

Now apply these to seat warmers, suspension adjustments, self-driving, or whatever else shows up in the future. If you don't hit all three, head back to the drawing board.

P.S.: This isn't limited to cars. It's equally true for any hardware product.