It also makes the map asymetrical, doesn't really fit, is too easy with the right preps for any class at all (pisorff/knockback one guy into the other guy, huzzah!), and because of it the regular halls of steel are a bit jokey compared to the Labyrinth and the Shifting passages (but not Ick Swamp since Ick hands out damage boosters at every corner).
Also, it's "complete with 3 relevant classes" quest overlaps with the "complete with 4 to unlock VHoS" if I'm not much mistaken, and that quest is then asymetrical too.
Why is it still in there I have no clue, but having a HARD Halls with indomitable and Blah Blah at some difficulty in between the current hard and the current vicious, with potentialy easing up on the cramp a tiny bit would probably be better.
I almost got pwned by Shifty Brickwork!