Not sure about these ball flight laws in terms of implementation. The old way worked for a lot of people and it was a relatively simple thing to do. The new way seems just "iffy" in terms of implementation and due to the path AND club face open/close - still make for a complex relationship.
If the swing path were perfect, then yeah, it's easy to just aim the club face, but the swing path rarely is (for normal people), so it's not so easy. IMO.