I think you Guys are missing the point.
It's not a matter of "need" it's about "want", and because he can.
As for using all that power, very few people can do that anyway, with the majority of the bikes that are on the market now.
How many people can say that they can actually use all the power that a Stock Rocket produce's.
By that I mean, give it FULL throttle and regulate the revs by using the clutch to load the Engine so that it doesn't over rev..... in first gear ?
Then in subsequent gears from there on.