So why would you bother repacking silencers etc? Just to make it sound nice?
If traction is marginal a less powerful, smoother and yes, easier bike to ride will break traction later.
A 280 Aprilia engine in a Sherco frame will simply NOT grip the same as even a 290 Sherco engine for example.
I do get the feeling that we will not agree on this however long the thread goes.