Its easy, the accelerations are completely different and very hard to gauge. Also you have the elderly going speeds that does not mach their reactions, while also being unaware of how fast they are going. If you try biking with them it become very obvious how many dangerous situations they cause compared to true e-bike and normal bikes.
Pedal assist feels like amplifying your natural power. The boost it gives is perfectly matched with your own movements so it feels more like you are just super fit. And there is far less chance you can just slip and apply too much power unlike throttle controlled.