Oh so if you are a professional juggler it would be completely valid if you keep juggling all the time while driving? Dont think the police will see 'you just dont know how to juggle as well as I do' as an excuse if they stop you.

Also what about eating, drinking, talking on the phone while driving? Obviously those are only distractions if you havent properly learned to eat or talk, right? Shifting is a distraction, period. It gets less distracting the more you are used to it but it is never zero. There is absolutely no reason to shift manually nowadays (except for racing obviously).