I think we also should factor that the black wallz may seem lazy (they are), however, there's a CRAP TON of people afraid of the DARK -- I'm sure more than those afraid of clowns or any other phobia. And those scenes work like magic for newcomers. Taking newbies through those scenes and the dangling threads start touching them, they start screaming their faces off and running out of the rooms. It's the easiest, cheapest, and laziest but most effective scare. It's one of the many reasons when I ask newbs what their fav mazes were, they're on complete polar opposites of what my list is. Mainly because I look at a lot of the mazes from a design point, but they're simply just going off if they were scared or not based on their personal fears -- and very commonly, fear of the dark is numero uno. So I think it's possible these black wallz may actually be here to stay and may even get a lot of people talking about how scary and dark the mazes are.
God I hope not, but this is a major possibility.