Not at all, but doing 50 through a 30 zone is. Just to clarify, I meant going overly fast, not road riding in general. Pretty much the only similarity between road and mountain biking is the BSO between the legs, they’re completely different in almost every other respect. You can’t compare them so easily, particularly in this instance.
Downhill road segments should be culled, you just can’t behave like that on the road. Too many big, heavy, fast metal things involved. Maybe they could implement a system that compares the rider speeds to the limit for that section of road and then deletes the segments which encourage riders to ride like idiots. That said, there’s plenty of unrestricted mountain descents knocking about.