“Improvement is not just about learning habits, it’s also about fine-tuning them.”
Habits let us do things automatically, without thinking. And this is mostly a good thing. However, it has also some consequences—once we automate a habit, we stop thinking about it, and as a result, we do not improve any further.
To really master anything, you need reflection time. This means that you create a habit, then you reflect, fine-tune it, and create the habit again. This cycle continues until you achieve perfection.