I don't agree at least not without some conditions and reservations. I can think of folks who would have loved to have been able to have extended their live long cycling careers a bit longer than their health allowed. I remember my mom not quite being up to riding when in her late 80's and wishing she could ride (she was doing centuries well into her 70s). She was still sharp enough mentally and almost able. Lots of older and/or slightly handicapped folks may fit the category of folks that might be able to ride an ebike but not a regular bike. Some folks that are just in a very poor state of physical fitness may actually try one and wind up becoming cyclists. Heck even folks that are just too lazy may wind up being inspired, stranger things have happened. I think places like the C&O towpath near DC are precisely where all these folks benefit the most and serious cyclists are impacted the least.

I have another family member now who has a hilly commute that they just are not up to with a small child on the way to daycare in tow. They want to use a bike for their commute. They want to pedal, but need a little assist. The ebike is the answer for them. I guess you may be including this case in the "something else" category though. For that matter maybe all of the cases I mentioned could be in the something else category, but I think that some (most?) of the national park trails that allow ebikes are exactly the kind of places that suit them.