No no, after initial degradation, the battery health levels off and stays around 90% for a long while, generally.

My ICE vehicles are maintained but don't have the new car fuel efficiency either. I wouldn't be surprised to find they have lost 15% since they are pretty old.

Recent research shows that batteries are likely to outlast the body of most EVs, if the battery is not abused.

Also, people overestimate the typical daily range used with the primary or secondary vehicles, but even short range EVs cover the average daily drive for most.