And if a cheap, used, decade old EV battery is down to 80% of its former max life, that's still a very usable vehicle for almost everyone. It probably isn't even noticeable outside of long trips.
In fact, I can vouch. I keep the max charge on my new battery at 80% to extend its lifespan. I don't even plug the thing in every night. My charge from 80% down to 45% can last nearly a week.