What is even the thing you are supposed to reach after 10k hours? I would guess that it is essentially impossible to reach world-class performance in anything b

What is even the thing you are supposed to reach after 10k hours? I would guess that it is essentially impossible to reach world-class performance in anything by practice alone, there will always be gifted people with a head-start over the average person. But you can certainly become quite good at something with enough practice. But also probably not at everything, there are almost certainly things that you are just not made for, where no amount of practice will make you really good. And all things considered, 10k hours is not that much, it is about five years in a full time job. A developer with 10k hours will not even have 5 years of job experience if you take into account time programming during school and university years if you start programming as a child or teenager. With that you have a good chance of not being a bad developer but less than 5 years of professional experience will almost certainly not make you a really good developer unless you started out as one of the rare gifted ones.