A higher deflection shaft will generally jump better. It can also be of some advantage to someone who happens to use back hand english and the appropriate bridge length for that shaft to most take advantage of the squirt cancellation effects (has to be a pretty high deflection shaft to have a chance of helping in this regard), and there are several other benefits that I have thought of and posted in the past (many years ago) but that escape me at the moment.
That said, for the most part they were fairly minimal benefits so I'm not really arguing with the spirit of your inquiry. On the flip side, I haven't seen any good evidence for lower deflection being of much if any consequential advantage either. I know all the theories/arguments, and some even sound fairly intuitive, but I've yet to see any good evidence to support that there is any actual consequential advantage in reality.
In fact, the best evidence we have pretty solidly supports that it makes little difference in how well we can/will play with either (or how fast we will get to a certain level with either), and that we must obviously be adjusting for low or high squirt/swerve fairly equally well even if that wouldn't have been our intuitive guess about the matter (talking about/within the spectrum of the most commonly used shaft types out there, not something crazy).