🤣 Teslas don't even report the mileage correctly, who the fuck actually is believing that shit without a car history.

That assumes the vehicle BMS is recalibrating itself properly and regularly. That's not a guarantee, especially with as many cells as vehicle batteries use.

Cell phone manufacturers just started doing that and displaying it recently, and even then not all manufacturers. And that's only one or two cells.

There are plenty of posts online of people saying their cars aren't getting anywhere near the displayed range as they age.

That assumes the dealer or owner lets you. Granted that's enough for me to walk away from the sale, but generally I've not had a good track record with dealers letting me pull battery health figures as it's beyond what they understand (dealership training is very very poor) so it scares them. Owners generally are happy to provide me a print out.