FWIW - The ten-thousand-hours theory is just that, a theory. As pointed out many of use old timers have way more than ten-thousand-hours and are not master musicians. Plus I have seen and heard many young kids whom couldn't have put in 10K and are fantastic, maybe not master musicians but close. And some are master musicians after 10K. We are all wired a little differently thus we all learn a little differently.
Just my 2 cents and your 2 cents may be different.

I think my wife has started to show the first signs of dementia.
She said she can't remember what she ever saw in me!

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware