Ya I've been there when Extrovert was closed due to the icy ruts and a few rocks.. Then they opened it up for a minute.. Half the posse, mostly pretty good skiers, were picking up yard sales.. They closed it again an hour later.. There are definitely post ice storm or severely windblown terrain that isn't reasonably skiable and gets closed. It's usually obvious to everyone though, not a should we or shouldn't we close it situation."There's no such thing as ice in Colorado."
I skied Blue Knob many times, including at night.....you are so on target!