Good point Champ but remember , a high bouncing ball off either side is more difficult to get back than a hard drive that is right in the slot. A regular rally ball with a high bounce would be a shot that most players of any standard would struggle with.
That's why Rafa's regular 'holding shot' can still win him free points or set him up for the big one.
A weapon is essential however until you receive a short ball you need to have the ability to still trouble your opponent. The high ball does just that.
Thanks for your input Champ , you are thinking like a tennis player......