It is being a bit over thought.

I can get as much work out with my e-bike as with my pedal bike because I can pedal at 250 watts on either bike. Its all in the effort I put into it.

The difference the e-bike
- I don't have to pedal if I don't want to (which means you will probably take it easy)
- the motor helps a lot with accelerating from a stop
- the commute time is shorter on the-bike.

I work up just as much sweat commuting with the ebike, because I put the same amount of power into it through my legs.