If you've tried to put up a tarp when the wind is gusting, you gain an appreciation of how much easier a skinned tarp is to deal with. Once you get the ridgeline locked down and nice and taut with a skinned tarp, the rest of the setup goes very quickly. If a tarp is bunched up or put in another stuff sack, I really don't see how much faster it would dry out compared to a skinned tarp. I think that regardless of how you store the tarp you will need to spread out a tarp for it to dry out completely. OK, so maybe the skin weighs an extra oz or so compared to a conventional stuff sack. Different people will make different choices on whether that extra weight is worth it.