My wife rides an e-bike, not to rip up the trails but to keep up with me on my 29 Mtb. It's great because we can ride together (it gives her parity). Sure, there are people "beating" strava records etc, but that's on a par with being juiced up. For races, there should be a separate category, although i don't know how they are going to police it to get parity between the competitors.