Remember those old gas mopeds with pedals? Should they be allowed on non-motorized trails, too?
Not all ebikes are created equal. I'd argue that a 1000 watt-plus, 60-70 pound bike with a top speed of 35 mph is in no way a bicycle. It's an electric dirtbike. Keep it on motorized trails, plain and simple. Honestly, there should be no argument about this, period. Here, the pedals are basically vestigial appendages...nearly as useless as nipples on a dude.
By the same token, if it is primarily a pedal bike with a small motor meant for assist on hills, I can see the the gray area.