It seems like you refer to second hand advice rather than a true & knowledgeable source.
If you go to the right sources you will find this as part of a very thought through system. After all this is pretty much what Ben Hogan did and a lot of the greats of the past and present.
But the "take the hands out of the swing" thing will mean something entirely different, like: Maintain leverage through impact and get as far away from a flip as possible.
Well, yes and no.
"Swing left" and "big muscle/take the hands out" are popular phrases in the magazines and the experts who write the articles. These were also right from the mouth of the last pro I took lessons with. He has taught some good players around here including Ben Curtis in high school.
The problem is that there isn't enough precision in these phrases so it's easy to get off track. Swing left of what? Or to what? How far left is TOO much? It is a feel that didn't work for me. I wasn't tracing the plane line and it disrupted my finish swivel.
The hands have specific things to do in the swing. Instead of saying "take the hands out of the swing", I have found that it is MUCH more effective for me to think about what the hands should do. More precision in, more precision out.