We don’t even know if the batteries on those things will worsen with time, like all other batteries do.

We absolutely do. Of course they degrade over time. But they last much monger than expected. Today they all come with 100,000mile 8-10year warranties.

You cant replace the battery on a EW, it’s cheaper to buy a new car.

Of course you can! They’re designed to be replaced. Most of them can be swapped out in about an hour at an equipped shop. And the cost (outside of warrantee) is typically about 20-30% the cost of the car. So it’s absolutely cheaper to replace the battery than buy new.