Here's an analogy I thought of. So here's a standard trail on the hill:
Various lanes, slow people can go slow, fast people can pass, etc. On the flipside, here is what the park is like:
Certain "lanes" for certain features. I'm sure you're not too happy on the road when someone is in the far left lane decides to dart across to make a right turn. Same can be said for someone stopping in the middle of the road over a hill / round a curve in a blind/bad spot. It is part of the "skier safety code" "Do not stop where you obstruct the trail or are not visible from above."
That is great that everyone on the hill wants to have fun. Everyone on the road wants to get where they are going in a timely and safe manner. Someone who just blasts across the road in random directions or kid/parent who does the same in the park. Not safe for anyone.