Even though they were technically legal some of the trails banned Class 2/3 E-bikes and scooters when they exploded a couple of years ago due to complaints from locals. The Super73 is a Class 2 E-bike meaning you can peddle and/or used the throttle. The existence of a throttle makes in illegal with gas powered motorcycles or mopeds but the laws have not caught up to the advancements in e-bikes so you still are allowed to ride them on most trails because they are not gas powered. I could see why some folks taking a stroll on a trail would complain about somebody flying by them going 30 mph while yelling on your left.
Electric bikes should be banned on trails. I was in the city when I heard via the news a woman who was crossing in the crosswalk the dude on the e bike didn't have a horn or yell out. Dude just ran over the poor woman and killed her.