As a 10-year-old brand-new saxophonist, I learned a bunch of tasks I needed to do to play the instrument: blow in a certain way, form my lips just so, put my fingers into such-and-such positions, and so on. Every time I thought I had learned all of the skills I needed, my teacher would add some more.
In the 30 years since, playing saxophone and other woodwinds, I have mostly worked on doing less—letting my embouchure relax, keeping my jaw still, keeping my breath support consistent, moving my fingers more efficiently. The more I can strip away the excess effort, the more my playing is easy, pleasant, pain-free, fatigue-free, and expressive.
On some level it feels more like teaching if I can tell a student a new thing to do. Assign them an additional task. But the most productive and valuable lessons (or personal practice sessions) are often the ones when I can convince a student (or myself) to do one fewer thing.