It sure would have helped MY game greatly.
OTOH, it can only be applied when you have consistent incoming ball speeds with consistent bounces, something I've never seen in a real match.
POSTURE is extremely important, but the legs need to do the work to get your torso into position. Somehow, the opponent is constantly trying to overcome your leg's ability to get into position.
The reason we reach out, stiffen up, jump, and lean back is we didn't recognize the bounce of the ball while it's incoming from the other side of the net. All the perfect "neutral spine"/posture will never teach recognition of the tennis ball speed, spin, and bounce.
It will help, it won't help much, but overall, anything in the positive direction is better than eating a roast beef and colby jack sand on sourdough.