When you begin many new exercises the issue is information, knowledge, how do I do this, whatare the notes. Usually within a few weeks or days, however, the point of the exercise becomes skill and speed, how well do I do this, how quickly can I do this. Many people miss the transition phase, where the usefulness of the exercise moves from information to skill. Thus they may plod along for months doing an exercise slowly, at the same speed week after week - and never develop the skill that was the ultimate purpose of their work.
Exercises are the tent pole raising up all of your playing ability. As they come up, everything else comes up, too.