At a wild guess...
That could be good for correcting your line mid-corner. I think we saw Marc Marquez do it in Sepang....
As in countersteer back up to run wider, then let the bike come back over again so the turn tightens.
As far as speed and traction... any time you can get the bike more vertical you tip the balance back toward more traction, right? So I'm thinking it gives you a bigger margin, and you can get on the gas harder/sooner.