Yeah - if I were signing a contract for these semis, I would want the '1 million miles' warranty to mean 'if the truck stops working and can't be repaired by Tesla within a week, then Tesla will buy back the truck for the purchase price * miles driven/1 million.'

I'd define 'stops working' as 'stops being road legal or able to drive at the speed limit with the rated load for at least half the advertised range'.

So a broken cab heater or faulty app wouldn't be reason for a warranty return.

I would obviously expect to pay a higher ticket price to get this warranty.