Well that is where we have to disagree, since I think this could have far more potential than our present e-bikes have. How?
Well first there's the well known fact that the British majority are averse to pedalling. They couldn't wait to drop the inadequately powered bikes of the '50s in favour of twist-and-go scooters. For most pedalling as an option, yes, but as a necessity, not if they can help it!
Then there's the evidence in this forum. Time and time again people come in and say they want a bike that can power them up hills, regularly they add they don't want to pedal too much, almost universally they want a throttle and many want to power from a standstill, even uphill. Our present e-bikes don't get near to managing those wants, but one with a 1000 watt motor can. All this is especially true of those who are well overweight, and that's a self-confessed very high proportion of new members.
Those with such requirements could have a choice in future, without a rear number plate and not meeting their needs, or with one and able to provide what they want.
It will still be a bicycle just a touch heavier than present e-bikes, but that's not too important anyway. There's a world of difference between the minority who enjoy cycling as you do Mussels, and indeed as many of us in here do, but we are a tiny minority as I've so often pointed out. We are the enthusiasts, out of over 100,000 e-bikers out there, most of them just utility users who often have twist-and-go scooter style e-bikes. Well under than 5000 e-bikers are members, many not in Britain and many of them were only momentarily members anyway.
So that's what I'm interested in, the majority public, particularly the pre-qualified, who are unlikely to ever own a present type of e-bike. The fact of registration would potentially expand e-bike dealer's businesses since this lends itself more to retail premises than online, and the expansion into an additional class could grow this forum considerably. I think you might be averse to including them, but I'm strongly in favour since so many members already ask for these provisions on e-bikes.