...almost nobody buys $100,000+ luxury cars planning to keep driving that same car for 30 years.
Or even 10 typically.
So that's adding basically $0.00 value to most S/X buyers, other than better resale- but since they're usually lazy and just trade it it, not even that much there either.
Average length of vehicle ownership in the US is only about 6.6 years. That's all vehicles including cheap ones.
And not because ICE cars are typically dying by then... even most garbage ICE cars last quite a lot longer than 6.6 years these days, and tons of quality ones are running around after 20 years no problem.
It's kinda like the idea of a 1000 mile battery that Jim Cramer and others have mentioned- in practical terms it's not actually valuable for 99% of owners other than mentally... 1000 is so much range it entirely eliminates anyone thinking of range anxiety- no matter the fact that's not really a thing NOW either with 300-400 miles of range and 99% of the US being less than 150 miles from a supercharger.
Likewise- Almost nobody drives the same car 450k miles (current lifespan of a tesla battery), most don't even drive half that in the same car...but 1 million miles, mentally, would get folks over the hump of "worrying" about replacing their expensive car batteries during the time they are likely to own it.
I agree that for the private car owner a 1m mile battery doesn't add much value (perhaps some benefit in residual values) - but if your focus is on a robotaxi fleet then it adds tremendous value.
Not only are you saving on fuel, maintenance and driver salary costs, you're also saving on depreciation costs too. That's all the important non-revenue lines in the P&L for a robotaxi company and makes it that much harder for competitors to compete - if alternative EV's need replacing 2x as often the competing robataxi Co's will have to pass on the costs to customers.