I drive a 23 year old car, and the only thing I've had to replace that I wouldn't have to replace on an EV is a timing belt.

EVs are heavy. Their weight eats through tires, and reduces the service life (or increases cost) of suspension components. The battery in my mother's Chevy Volt is doing fine at 10 years and 100k+ miles, but there's no telling what condition it will be in at year 15 or 20 - both reasonable benchmarks for durability that no mainstream EV has reached yet.