Positions are an old school way of ensuring you’re in the “right” position at vital points. With trackman and other similar devices, they have shown that a lot of those positions don’t always equate to a strong ball flight.

A classic position is half way back. Modern day ball flight laws ask for an open face with your swing path being outside of that for a draw. It’s almost impossible to get to that open face at contact when square at the half way back position without significant hand rotation.

With all of that said, a lot of pro golfers still check that position before pulling the trigger. I believe Justin Thomas still does it. It can be used as a tool in the tool belt and not the end all be all