05-09-17, 10:11 AM
It's not just about being able to get the gear located like with the old boxes, it's to do with keeping the bike balanced.
Just downshifting and letting the clutch out puts the stress through your clutch and drive train, potentially locks the rear and if approaching a corner will unbalance the bike.
It's a good technique to practice so that the bike is kept stable. I only don't blip if I'm actively decelerating and so use the braking force of the low revs to help.
It's the same reason race drivers in cars use heel and toe, so that the car is kept balanced through a corner.