E-Bikes definitely add to more trail wear, pretty much everyone I know that's bought one has gone from 10~20k rides to 20~50k rides and their rides are more frequent. I've seen a few here and they get to higher speeds going downhill and then skid everywhere to wash off speed.
That's a pretty flawed argument.
Yes, more riding means more wear, but could also say that the huge uptake of mountain biking as a whole has caused more wear and tear on the trails. Do we limit to how many riders can ride each trail and that you can only ride once a week? E-mountain bike sales are less that 20% of MTB sales so the wear and tear is by far coming from the non-Ebikes.
Ebikes get no more speed going downhill than a normal bike and skidding into corners has been a problem with riders well before Ebikes were a thing.
I've heard all the thinly researched arguments against Ebikes and I haven't seen one that stacks up with any real world evidence.
"They are heavier so do more damage" There's far more difference in the weight of the rider than the bike.
"They cut switchbacks" Cutting switchbacks has been an issue well before Ebikes existed.
"They are new to MTB and don't know how to respect the trails and other users" That could be said for anyone new to mountain biking and a large majority have been mountain biking for years.
"The speed differences are too much between Ebike to non Ebikes" The speed difference between a elite rider and an unfit beginner is far larger.
"They can ride farther so cause more wear" So we start restricting to how far people can ride now?
Like anything, it comes down to education, whether it be a code of conduct placed at trail heads, trail etiquette pushed in MTB media and clubs and calling out actions if it is seen, and that goes for all riders, regardless of what they ride.