We sort of know what to expect with powertrain longevity on used vehicles, but I'm not sure we know the same for electric vehicles just yet.

Consider: I had my last car purchase (which I knew would be used) between a BMW 4 Series, a VW Golf R, and a Subaru STI. I went with the 4 Series. The Golf R and STI are often used as track cars, and 40k miles on a Golf R may very well be the equivalent of 100k miles on a regular Golf.

I admit this is a very specific use case, but there are other specific use cases (e.g. police car - probably spent 80% of its engine's life idling and not racking up miles) that we know to look for, that we simply don't know to look for in the EV market, because they haven't presented themselves yet.