I am not so sure about that. There is a gate at the bottom of the Flank at Function that has a sign that states no motorized vehicles and i think also at Loggers lake but I am not positive. I did see trials tire tracks Saturday on my way around Loggers lake last Saturday. I doubt that anyone would be able to take a motorized bike around Lost lake or Sea to Sky, or Riverside farside without getting in to trouble pretty quick, if caught. That said I would assume that other trails like Tunnel Vision and the like are fair game.
I think it behooves us mountainbikers to distance ourselves from the motorized/assisted riders in terms of access advocacy. Old man hiker will be even less inclined to endorse e-bikes than human powered bikes.
I should've clarified my statement somewhat I guess, yes they aren't allowed on RMOW Parks maintained trail systems, or even the Flank, but that doesn't preclude utilizing existing westside trails to access things like the alpine on Sproatt or Rainbow as they have done for years. That being said I know local trail builders who have requested trials riders help break in new trails, as I also know builders who are upset that trials motos have negatively impacted some recent trails.
I actually generally agree with you, re. distancing ourselves, however, historical use definitely blurs many lines and makes this a tricky issue. The big thing for me though is that generally speaking, trials motos are very few in numbers and generally have little impact, so I'm less concerned about that then the industry pushing e-bikes to the masses in the future as technology makes more powerful motors, that are lighter, and last longer, and thereby allow people without proper skills to start accessing places that have traditionally required fitness and skill to access.