In reply to cap'nChino:
There are certainly widespread concerns about those pedal cyclists who go pelting along cycle paths heads-down at high speed trying to beat their Strava time, but most casual users pootle along at a more gentle pace. The problem is it is impossible to enforce speed limits so the only control is by restricting the type of user. It is possible to ban motorbikes from cycle paths, but not different categories of pedal cyclists. Unfortunately that does mean that some permitted users ride faster than is safe or desirable, but opening up these paths to other high speed machines would only make the matter worse
Ebikes are aimed at people who want to cycle but who welcome a bit of assistance with hills or longer distances. They can be allowed on cycle paths because they are limited to speeds which are compatible with other users. If you are more concerned with going fast there are plenty of options, but these are not suitable for cycle paths and you will have to stick to the roads. In that case, you should be subject to the road's rules about tax, insurance, helmets etc. However if you don't want to be subject to those, you can still go on the road with an ebike just as an ordinary cyclist can.
Far from encouraging bike users, deregulating ebikes to go faster would only result in them being banned from many cycle paths. Many cycle paths, including most of the National Cycle Network which is not on public roads or bridleways, are permissive routes and the landowners would be entitled to exclude ebikes regardless of what the general law might allow. I think many landowners would probably do this if they were deregulated.
Apart from wishing to go faster, I am still struggling to understand what activity is currently impossible because both ebikes and faster mopeds/bikes/cars are not suitable.
Post edited at 14:34