It is funny to me that the biggest message that most people seem to have gotten out of Outliers by Malcolm Gladwell is the 10,000 hours of practice to be an expert idea. Even people who have not read it have received that idea. And like so many sound bites, it is a faulty message. Because it is not just 10,000 hours of practice, it is 10,000 hours of deliberate, focused practice with the intent of becoming good at whatever it is.
Growing up, I put in quite a few hours of practice playing the piano. Am I any good at it now? Minimally. Why? Because the practice I put in was casual and indifferent, with no focused attempt to understand what I was doing or how to become really better. I was punching the time clock, not actually trying to master a skill.
Simply doing something you want to do for 10,000 hours is not going to make you an expert.