Because I'm trying to learn the 5sk system, I've become more selective on which YouTube videos I'll watch. If I'm watching a PGA instructor and he says something like "it's ok to have lateral movement of the head" or "restrict your hip rotation", I'll usually close out the video.. Foley's philosophy seems similar to 5sk - at least to my uneducated eye. Any way, I like him.
As far as practicing with a different club after each shot as he describes, I started doing this early on in my first year because it just makes sense. If I were to coach any sport, I would try to instill the idea that you practice with the same intensity as you'd have in a game, and you try relax as much in competition as you would during practice. At least close the gap a bit between the two.
I've played in enough men's softball leagues that I see the same thing at every practice. The pitcher will throw BP with very little arc and the team will hit line drives all day long at practice. Then when they face a pitcher during a game throwing pitches with arc and spin, they'll pop the ball up. Go figure,