Periodisation - the Natural Enemy of Skill Progressions
When I was old, pragmatic and wise (?), I was coaching the same development squad (different athletes by now!). I had a loose periodised plan (mainly for load management), but mostly planned based on skill progressions.
The difference between the two is that, with skill progressions you move on once you have achieved the level of competence you were striving for, but with a periodised plan you move on when you have scheduled to do the next thing.