There is an ongoing debate between practicing part skills and then combining them into whole skills, once each part is mastered, to work on sequence, flow and smoothness versus practicing whole skills. I have seen this manifest as a person preference. My two sons chose to learn breaststroke differently. The oldest wanted to practice the whole skill. The second chose to practice kicking first, then pulling, and then later combining the two.
A conceptual framework of learning on which domain-specific, individualized, theories of learning can be constructed.