I think you are minimizing the potential and very real problems on road. And on paved trails. The 2 crashes I've heard about locally both involved excessive speed and the E biker running into other bikers running wide on a tight turn. That is what got the trail signage in short order. Of course a tight trail is slower. But next to nobody here is prepared for a blowout or smacking a big pothole at 28mph. Bike tires aren't necessarily built for heavy loads AND high speeds. (some are) Braking gets extremely sensitive at 30+.
It's not about the open areas with lots of time to scan to see everthing happening.
It's when things suddenly happen in front of you that you didn't have time to plan for.
You slide at LONG way at 30mph and you're aware of that fact as it's happening, losing flesh with each second.
(been there, done that, have the scars to show)
In motorcycling we say "dress for the crash, not the ride". Cuz the crash is probably inevitable if you ride enough.
Yet other than wearing a helmet, who here is dressing for a 30mph crash? PS - in a bike crash youi're often tangled with the bike so the 50+lbs is relevent here too.
My Stromer ST1 was a 28mph bike and easily peddled to 32+. Great fun. Scary too.
This aint' video games.....