Do people bust control steps often? And if so what is usually the outcome?
Within my terminal area, I occasionally see descent below the CTA step on a visual approach.
Although it is a pilot's responsibility to manage this aspect of their profile, if I see an aicraft hugging the steps, I would step them down till about 12nm.
IF I suspect or observe it's about to happen, I'd give the pilot a level maintain (and explain why) and/or give traffic if it's too late to catch before punching class G.
I'm curious as to how much of this is FMS related or pilot managed on the more modern types (A330/320, B777, B737 NG)