My eMTB is easily capable of being ridden without the motor switched on. However, it's a 20Kg lump of a bike, possibly 18 without the battery. My unpowered MTB weighs 13Kg and is more adept off road. The ebike however, powers me to work, relatively unsweaty, at an average speed of 19MPH*. That's with Schwalbe Ice Spiker Pro tyres on and with an undulating route. If I want off-road fun, I'll take the Carrera; if I want speed with comfort, I'll use the ebike.
*That's with the power setting on 6 out of 18. The higher settings would be much faster, but would exceed the margins of safety I'd be happy with regarding brakes, lights and other road users' perceptions.