Not a criticism of e-bikes, but I discovered an unexpected danger related to e-bikes which was much less an issue with traditional bikes: when driving a car, it's now much more difficult to judge how much time you need to pass a bike. I would say without hyperbole that it's much more dangerous now, to the cars and the bikes.
I currently live in a Dutch village, so bikes and cars share rather narrow roads. The roads are narrow enough that two cars barely fit side by side. Normally when you're approaching a bike from behind, you know you only need 2-3 seconds to pass it. If there's oncoming traffic, you can easily judge if you have time to safely pass the bike, or if instead you should slow down and wait behind it.
But now that bike which would normally be moving 10-15kph may actually be an e-bike doing 24-ish kph. That's quite a big difference. And if you're doing 50-70 as you approach, it's _very_ difficult to identify from a distance if that bike is going 12 or 24. It matters too, because it might take twice as long to pass as you would normally expect.
Of course we can adapt and take the safe approach, always slowing to the bike speed before deciding to pass. But not only is that rather aggravating to go from 70 to 15 and then accelerate to pass, but it's wasteful on brakes and fuel. Also, if there's any oncoming traffic further down the road, you're much more likely to now be stuck behind that bike for an agonizingly long time.
For the cyclist, they will now be more at risk of a passing car misjudging and pulling back into the lane, cutting the bike off.
Tangentially related is the (new for cars) Tesla problem. That's when you're merging or needing to pass someone, and that someone is driving a Tesla and has a bad attitude. Historically it was pretty easy to judge if you had enough speed to pass someone; but now if that someone is driving a Tesla (or other new, performance oriented electric), they can decide to not allow you to pass by simply stepping on the throttle. They can so quickly accelerate that they can fill that spot which was safely available. If you're not paying close attention (being prepared for something like that), or if you have nowhere else to go (merging, lane ending), you're at great risk of accident.
So in summary, electric vehicles are dangerous! I jest, but they do indeed present some new challenges that don't make them more welcome on the roads.