Yup.
That's exactly how I think about this model.
In some domains, the range of what it takes (in terms of 'practice' to mastery, and even what "mastery" means) is much narrower.
I venture that this seems to be the case in many academic and performance disciplines. 6-16K hours = "necessary" for, say, professional expertise in math, neurosurgery, or music... but definitely insufficient for all but a handful, when one looks at the general population.
I think that innate genetics plays a far larger role than mere hours of devoted practice ever will.
I am/was never going to be a ballerina. Never. Wouldn't have mattered how many hours I spent at a studio, nor how talented my teachers were.
