Practising ideation tools?

The old adage “practice makes perfect” has been applied to many kinds of learning, from drawing and creative writing to music and sports. But although research has shown there is a positive relationship between deliberate practice and mastery, practice on its own does not make perfect, and only accounts for a small amount of the variation in skill level (other important factors are innate talent, and working memory capacity). For example, practice accounted for only about one-third of the differences in skill in both music and chess. Or, in video games, the way a person practises is as important as how often they try to improve - with those who do not cram in sessions but go away and reflect on their mistakes performing better. This suggest that designers should not just practise a range of ideation tools, say, sketching, but reflect on their tool practice: Why sketching?