I do it for 10-ball. Pretty much it's the only advice Shane has to give in his break video...
"just try to pop the cue ball. Whatever you did to get the cue ball to pop, do that some more."
A local pro who plays about Shuff speed told me the pop is important, but wasn't quite sure why.
The balls you're trying to make just seem to go better. The 1 ball maybe "escapes" more easily
bouncing back towards the corner in the kitchen.
On the other hand Ralph Eckert said it's strictly a trick for managing cue ball position.
He doesn't think it helps you make any of the intended balls.
But any spin the cue ball has dies when it bounces hard off the slate.
By the time it lands a second time, there isn't much topspin or backspin left.
We've all seen Shane's cue ball hop backwards, bounce, then mysteriously die.
I don't think it beats scratches more. Scratches are about what direction the cue ball is moving,
not about how much time it spends airborne.
You will see plenty of pros jump the cue ball directly into the side pocket on the break.
Johnny Archer has said he doesn't like letting it go airborne. I think he said it felt too uncontrolled.
For 9-ball, I don't think there's any point in intentionally hopping it.
In the last US Open, a ball was made on the break about 70% of the time, and that number
would be higher if everyone took the time to read the rack and use the info in Joe Tucker's videos.
You can make the wing ball go at low speed, the soft break is deadly in 9-ball.
To cause more than tiny hop you'd have to hit hard, meaning less control of the CB and less accurate hit.
I'm not sure it's useful in any other game but Shane basically uses his 10b break when playing 8b.
Unfortunately the intended balls don't go as often (kissed out) and the cue ball gets kicked around too.
So maybe the hop is pointless there.