And this tracks for most skills. How good are you at tying your shoes? Probably average? Just how good can you get? Probably not that much better, all told. It is a clearly defined goal and likely has a limit on the skill you can build.

What about writing your name? Putting on your clothes? Making your bed? All things that are somewhat bound in just how good you can be.

Now, throw in something like "play the piano." Turns out, the expertise bar is much much higher suddenly. But, it you haven't been trying, how would you know?