IDK about you, but my ebike weighs 60lbs. Turn the motor off, and I get way more of a workout than my 38lb full sus mountain bike.
Though I use an ebike as a car replacement, I find biking everywhere has gotten me into significantly better shape, even though it is electric. It can also tow a lot more gear up hills than my standard bike!
The most important quote in the article! And also the section about towing a heavy load up steep hills on a normal bike, feeling like you're gonna throw up, and then driving a car everywhere on 5.40/gal gas.
An ebike is a replacement for all of that.