The reason I singled out CD bikes and torque sensor is because shops stock what sells and in turn, what sells feeds back to what shops stock. If your budget is £2k, there isn't any offering from direct vendors like Woosh, you have to either go to the shops or convert a bike, so the choice is limited: Bosch, Yamaha, Brose. They all give the same sort of ride.
it's often the case of what's best for the customers. A lot of our customers have the usual troubles that come with age, knees, hips, can't lift the leg high enough, balance, oxygen etc. CD bikes with torque sensor are not as good for them as a step through bike with a strong geared hub motor, a rear rack and a full throttle.