This is probably not new news for some of you but this article from Snowbrains is the first that I heard of this.
I have some thoughts on the policy but I'd like to hear from some of those who ski Snowbird regularly.
The gist of it:
Snowbird is a pretty busy mountain and has a variety of speed people are cruising at. There are several places where all the downhill traffic is funneled together. People skinning up can be a danger in those high traffic areas.
I can definitely see why they implemented a new policy.