We do not know the real reason behind it, and might find out when some journalist will push them to answer.
But to me it is NOT an issue. It's just a 'get used to it ' thing. Common, are we all so tight up that we can not adapt to this ? Using joy stick, sticks, paddles, puddles , buttons, computers or any other devices is always different. And the brain/ hands adapt very quickly.

The gears on a normal motorbike goes first down and all the rest up. But when you use a racing motorbike, it's first up and the rest down....

So it' s the complete opposite. And for non pro, it does not make any difference other then getting used to it!!