Another way to put it: try to perform a skill you have never practiced. For example, if you've never played the piano or tried to read sheet music, see how long it takes you to play a few notes correctly. It's complex enough that you'll very likely find yourself limited to around 10 bits per second. You shouldn't count the bits handled by visual processing, basic motor control, and other things you have practiced all your life. If you practice the skill, the skill moves out of your conscious processing and no longer counts toward the 10 bits per second.
> You shouldn't count the bits handled by visual processing, basic motor control, and other things you have practiced all your life.
Ok, but how to count bits for your example with piano? It has 80 keys or so, isn't it? Should we take log2(80)=6.32...? Of if you are working with only part of the keyboard, maybe we should take log2(7)? How many bits per seconds of processing it takes to keep my hand on a keyboard in a right way that was shown by a tutor? How to measure it? Does my experience with a guitar makes it easier? How many bits easier?
Your argument boils down to “exclude anything faster than 10 bits per second, so then you’re limited to things which are 10 bits per second or less”. It’s extremely unconvincing.
