From what I have heard, the pamphlets were only handed out for a few days and then stopped.
Most people assume scotters have no brakes, but that is not actually true.
They don't have brakes that you apply like a car brakes. The brakes on a scooter or power wheelchair are automatic. When you let go of the throttle (or joystick on a power wheelchair), it automatically brakes, without the driver having to do anything.
The complaint people have written about was that the pamphlet was not about safety; it was about courtesy.
One of the points people reported reading was telling people on ECVs to keep their distance from others to be courteous.
But, a lot of the hits are caused by things you mentioned, people trying to 'beat' the
ECV, like cars at train crossings or purposely crossing in front of the person using an ECV. A lot of the comments on the thread were reflecting the need for people walking to understand that kind of behavior is dangerous and how they should behave around ECVs - give them space, don't stop suddenly in front of one, they can't stop as quickly as someone walking.
No one would have complained if they handed out a safety pamphlet to everyone, added the information to all the patk maps or put a sign up with the information and directed everyone entering the park to look at it.