All forms of meditation require attention. With attention meditation moves mountains. Without it we while away our time. Use visual feedback to monitor attention and your success is guaranteed.
Practice skill improves very slowly. (You might even get even less effective over time.) A Zen Master said: “After twenty years you can finally say you have begun to learn how to sit.” Feedback changes this. Seeing what you are doing skill improves automatically, and great gains come from doing it better, not necessarily longer.
Buddhist tradition says: “Just sit… and eventually, maybe after many lifetimes, you will come upon the truth.” This assumes lifetimes of drifting and dreaming. With feedback however, a butterfly mind takes a bee-line. Quality, not quantity of practice counts most here, not hours spent meditating, but minutes on target. Beginners have instant success. Advanced practitioners have breakthrough intensity. Feedback prevents wandering and when you don’t wander you cover ground fast. This straight-line meditation is the shortest distance between you and your goal.