Smart simplicity is what I am seeking. There is so much to remember in tennis, I see even the pros forget things at times.
Now, trainees who routinely forget what they have learned may be of a concern. How do you not go back to the drawing boards when you have a planned simple practice? Reasoning helps and so do video replays if you have the option of taping your practices but re-occurring issues may eat into your drills, aims etc. If the few problems throughout a period of time you choose are the ones that keep a trainee away from raising his/her level, the coach may be in a catch 22 then.
What I have in mind is the contingent management style in which one fixes the troubles as they come. That without moving forward with any further plans. So, if the coach has a drill with ground strokes, forehand and sidestepping the balls, s/he doesn't get to sidestepping till the forehand is perfect. Sorry, I mean acceptably good to go on with it. I wonder how that may work out. I see trainers who move on even if the drill has not yielded enough success and that for reasons to keep the trainee satisfied with the flow of the practice. So, not correcting everything is understandable but moving on without producing success in one area may be of a concern.