For someone like, the only thing I would use this feature for is to make my list a little shorter. But looking at comments they have a hide function
I would have prefered a sorting system like my wishlist, like my "currently playing" games in top area. I'd also like a "Completion" on the profile, cause hell no I'm getting all achievements on every game, and with so many indie games from humble, and supporting non-finished games, its hard to tell if I finished by looking at "hours played". I want a generalized "completion" percentage.
But I've never tried to take a key, use it without Steam, I guess permanently delete allows you to sell your keys. I would sell my extra games from Humble that I don't actually want. But I'm a collector, right now, our Steam account has 299 in library (see why sorting would be preferable).
We've setup a Steam stream to the entertainment room, so kids with no one around when a little old. I wonder if they have a pin for Mature games.