This is not the same as being able to go > 60 mph anywhere, at any time, simply by pressing a button.
> When you get a bike like this you deal with the danger and wear protective gear just like you would with any other bike (motorized or not).
This only deals with the danger to the rider - it doesn't address the danger to pedestrians.
Bicycles have long needed a dedicated infrastructure as they are neither cars nor pedestrians.
Yes, I've done this before by riding all the way up a local mountain on a road bike, clad in lycra, then on the way down I went over 60mph. It was terrifying and the physical fitness required to get up there in the first place required months of riding to actually do it. Meanwhile literal kids ride these on pavements, in between people, in cities where pedestrians walk - it's simply not acceptable. And I do own and ride an ebike(limited to 15.5mph) legally.
Therefore, we should count our blessings that it’s not more common, rather than allowing devices that enable it.