My piano teacher would point things like this out to me. I would often tell her how I yearned to be able to play a whole repertoire of pieces like that. And she would reply, "Are you willing to practice for 10 hours every day, rarely with even one day off? That's what it would take. You have the desire and the skills, but that does not make you play like this (referring to adult artists who I admired). That takes lots and lots of work and practice, practice, practice."
So as it turned out, I was able to play pieces like this child did in the video above (at one time, but not now, as I have backed off quite a bit). But learning that one piece to performance level would take me many months. I was never able to juggle more than a handful of pieces at this difficulty level, in performance shape. Scratch that - I could only juggle "a small handful". And even that took a lot of practice and dedication. People may be born with a musical aptitude. And they may put in the years that it takes to learn the skills needed to play at this technical level. But that is not enough. I admire the people that take the next step and dedicate their lives to performance. I used to want to be them. But now I don't. I am happy playing for my own enjoyment these days. I don't do "show pieces" anymore. Now I play pieces that are technically much simpler, and are more dependent on emotion to perform well. Claire de lune is a great example. Technically, this piece is fairly simple to play. But difficult to play well, and really draw listeners emotions into it. A technically perfect performance of Claire de lune - where you hit every note, and your timings would make a metronome blush - sounds absolutely awful.