I think it is price. Here I see cars with batteries that last well enough for 10+ years, and I'm confident that the price will drop over time if I keep one long enough to actually want to replace it. Along with all the other parts that wear out. Over here I think new car buyers won't tend to drive their cars into the ground, with cars on the road after 20 years generally having been purchased second hand. I don't know how the second hand market or resale value of EVs will look.