As someone who lives in a part of the world where a lot of people cycle in general, I have mixed feelings about ebikes. When human-powered, speed correlates highly with proficiency and experience. With ebikes, that's no longer true, and many unskilled & inexperienced cyclists are now among the fastest on the streets. This is especially problematic with people using "speed pedelecs" at speeds up to 45kph. They're essentially mopeds with thinner wheels. I feel very uncomfortable cycling when they are around. They're mostly inaudible and it can be very scary when they suddenly overtake you, especially on narrow paths (which is pretty much every bike path in Belgium).

On the other hand, ebikes are a lot better than cars, so I'm willing to be more tolerant of them than I'd like. I'd just feel a lot better about them if infrastructure would keep pace...