- How will The Stabilizer help my Golf game?

It will help all levels of golfer by ensuring the connection of movement between arms and body going through the ball, a crucial point in the swing, helping you achieve consistency in low point and clubface control 

- Why can’t I just use an alignment stick behind the grip for this drill?

You could but feedback has shown that it’s uncomfortable having to grip both the handle of the club and the alignment stick leading to an ineffective way of practising