These guys muscle their bikes unlike road riders. Road riders are a passenger on a bike as it goes through a corner. A racer defies all physics to make the bike go beyond its normal capabilities.
it is all about the apex, grip, position entering and exerting the corner. These guys are making the bike do things that it is not designed to do, that is why Rossi just says "I don't know why I do it".
What they are doing (for example) going into a left hand corner (remembering they have slipper clutches): On entry they are still braking, they are forcing down the right hand peg (like doing a squat) while pulling back on the right hand handle bar. With the lean angles these bikes have now they can perform this maneuver a lot more aggressively by taking all the weight off the left peg, which means the left leg is swinging in the breeze. They are already pushing down on the right peg as they accelerate to keep the weight of the front tyre.
The legends of the 500cc era perfected rear wheel steering, but now with traction control the legends of the current era are still pushing the limits and still rear wheel steering.
The current day legends are forcing the bike to go where they want it to go, thats why they are legends.
Cheers