The hitting threads here all seem to focus on delivering power in the swing. Nothing wrong with that, but my experience is that if you don't hit the ball on the sweet spot the most powerful swing is no good to you at all.
For some, the hands approach helps them to square the ball up more consistently. I've always thought that in teaching hitting, you should start a younger player with that philosophy, then develop power as the player becomes more confident and comfortable and able to put the barrel where the ball is consistently.
It also helps them to adjust to off-speed and breaking pitches more, IMHO.
And with that, I'll now bow out, as the usual diatribes will no doubt take over this thread.