If you get five years of life out of a $800 phone and it's battery you're probably pretty satisfied, probably even appreciate the extra battery time.
If you get five years of life out of a $50,000 car and it's battery you're going to be really pissed, and you won't care that you got ten extra miles of range for five years
Pretty sure my phone is the most expensive thing I've ever owned, so a few extra years of battery would still be nice.
Also, predictability over time is more important than absolute performance to me. Being unreachable is scary if you're always on call for remote support, and getting stuck somewhere without being able to call a Lyft could be really bad.
If you get five years of life out of a $50,000 car and it's battery you're going to be really pissed, and you won't care that you got ten extra miles of range for five years