Just because you are licensed and insured for a car, does not mean you won't go over the speed limit or do other dangerous things. Same with an EMTB, there is an element of personal responsibility here. I see Suron clones on the trail all the time, let's start there because they are much easier to spot.
Excellent point & actually closer to reality. Personal responsibility IS the crux of this coming flood of new & powerful emtbs. You speed on the road, get caught & receive a costly penalty. The result is most people responsibly accept & follow the speed limit. We are always going to see hotdoggers shredding the trails to hell without a care or concern. If one cares about the environment AND their hobby/sport, they will take caution into their consideration when riding, especially when other riders or hikers are present.
The community in which I live has a very active environmental group the is the caretaker of over 9000 acres of community access lands. Many of these are hiking only trails, but others are long & well cared for snowmobile trails which are used by all, hikers to quad runners. For the most part, trail etiquette is followed & folks are kind to one another, no matter the mode of transportation.
On the point of more powerful motors, there are a few folks with them, (Surron type), that rip the trails to shreds. When we see them, we stop them & try to explain the point of NOT ripping the trails up. To my pleasant surprise, most are friendly & comply. (while in sight

)
My e-bikes are a hub drive 750w 85nm fat tire I converted to a road only cruiser and a 500w 120nm mid drive set for trail use only. Both are set to class 3, as it is legal here. For me the added power from the mid drive is a NECESSITY, rather than simply a WANT for more power.
Three years ago, about this time of year, I was hit by a very drunk driver. She burst a disc above a prior back fusion, & nearly ripped through the nerve root to my right leg. Doctors said walking would be an issue for the rest of my life, and riding a bike would probably be nearly impossible. Six months of intensive PT and my own workout regimen had me back on a bike by fall of that same year.
My right leg is visibly smaller & 25% weaker, even though I work it like a rented mule. In my case there is a physical NEED for more torque & power.
I surely hope there is some recognition within the emtb community, manufacturers & constabulary of the requirements of those who are disabled who still have it in their hearts to spin the pedals for all they are worth.
I'm nearly 68 y/o & have been on bicycles for 63 of those years, racing on & off road in my younger days. I can't & wont stop pedaling... even if some drunk bitch thinks otherwise.
Ride on!