Agree 100%. To expand on the analogy, if one only paints by numbers, one will only develop his or her skills so far. If one works on painting freehand, one may make mistakes along the way and turn out some not so great looking art early on but he or she will develop much better skills. This is what I see happening often with people who “need” their devices. The devices allow for a quick progression early on but some runners rely on these devices so heavily that they never develop skills that allow them to go far beyond that early progression.