Practice is certainly important. There are a huge number of amazing musicians out there who will never be stars because to become a star, it's about who you know and luck.Exactly. I'm no concert pianist, I don't have that kind of time and it's not my life goal. But I have fun at it, and I can play most pieces that I want to. (Except the fantaisie-impromptu... I've tried, but Chopin must have been on crack when he wrote it.)
I know some about it because I used to play classical piano competitions. I always took 1st or 2nd place, but I really don't care for the competition world. I haven't played in many, many years.