A benefit of Manuel and other hands / arm guys teachings are not only are they body friendly, but you don’t need a lot of practice time to develop that type of swing.
As I mentioned the body focused swings are in vogue right now. And there really isn’t much new in golf swing evolution. It’s all been done before. Like other things it’s history we don’t know.
A hands / arms guy I follow is Mike Malaska who was a disciple of Jim Flick. He’s big on the hands. Milo Lines is a disciple of Malaska’s, but incorporates the squat and turn pivot that is so prevalent in body focused swings.
Nobody says you can’t take pieces of things from different teachers and use them in your own swing. Another hands / arms guy I started following is from Sweden, Marcus Edblad. His stuff makes a lot of sense to me. Here’s one of his many vids below.
I’ve incorporated his pushing down of the trail hand into impact with irons with pretty good success. Especially my wedge play.