It actually isn’t. Which is why some of the highest skilled athletes in the world watch gameday footage on top of their practice and conditioning.

I practice too, but I still find it helpful to watch chess streamers talk through their thought process in the moment rather than reading/watching a structured lesson.

Unstructured practice is only one form of skill enhancement. Alone it is not usually an effective tool. That’s why coaches, books, training regiments exist for all sorts of things from sports to chess to games