A few days ago, I bought my first card featuring the cage. It's fine in Fullscreen mode, but on the desktop it's often more of a nuisance than a pleasant diversion. Dodging a moving model can be a challenge when you're trying to do other things, but the cage blocks more of the screen (most annoyingly at the bottom) and doesn't move.
If it were to return, my vote would be for some sort of partial cage or maybe just multiple poles as has been suggested. That would obstruct less of the screen in Desktop mode, but could still be turned into a full cage (when you absolutely don't want your models escaping) using custom scenes in Fullscreen mode.