One of the riskier aspects of e-bikes is the subversion of other road-user expectations. If I see someone on (what appears to be) a bike, feet on pedals, (apparently) coasting, a few decades of biking and driving lead me to expect that person to stop, or at least slow down. On an e-bike, though, they might maintain speed, or accelerate (!) without any change in attitude.
No harder to judge than a motorcycle, of course, but it will take time for 'static person on bike' to connote 'might accelerate without warning!' to the navigational lizard brain.