The Outliers book shows 10,000 hours makes you good at things.
Gladwell's book is, with respect, hardly convincing. It may well be that doing a lot of practice is necessary. It is not sufficient: there are hundreds of bands scuffling around the pub circuit who have played at least as much as the Beatles, but never achieved that (or any) success. It's a fantastic right-wing narrative: the poor are poor because they are too lazy to do the work the rich do, and therefore the rich deserve their success and the poor deserve their failure.
www.sciencedaily.com/releases/2014/07/140728094258.htm
Bill Gates did 10,000 hours of programming in his teens.
So why was he never notably good at it? Yes, I am professionally qualified to make this claim, and I have read some of the code he wrote in Microsoft's early years. Remember: not a line of MS-DOS, which was the thing that made his fortune, was written by him or Paul Allen (they bought it as a going concern, as QDOS, from SCP, and in turn that was hardly original). The Microsoft Altair 8K Basic, the only commercial product he wrote (in conjunction with Paul Allen, who reputedly did the heavy lifting) is perfectly competent, no more: its marketing was, however, a thing of wonder. Gates was, and is, a fantastic businessman, a fine man manager, and a ruthless and uncompromising commercial opponent. He's also been spectacularly wrong about several topics, not least his dismissal of the Internet (you may have heard of it).
That his father was a successful lawyer, his mother on the board of banks and his grandfather an extremely successful banker, which funded his private education and Harvard career is, of course, not relevant to the "from log cabin to Redmond" narrative.
I did 10,000 hours of classical music in mine
And yet you aren't making your career in the Festival Hall. Because even if it's necessary, it's not sufficient. You need to be talented and lucky, too.