Been thinking about this thread all day. Isn't there a point where no matter how much you play, practice, or are taught where you stop improving? You have reached your personal maximum skill level? I mean, not everyone will be a virtuoso, no matter how much they try. Not everyone will be Joe Montana no matter how many footballs they throw. Not everyone can be Michael Jordan no matter how much time on the court they have.
I waterski and have been for 21+ years. For many years we were at it 4 days a week. I reached a point where I wasn't getting any better. I still had loads of fun and was quite good....but I could not improve no matter how hard I kept trying. I bought newer skis, ropes, gloves, even skied behind different boats. I wasn't going to be able to turn any sharper, get closer to the water horizontally or improve my slalom times.
Just thinking some of these guys have reached their max level of proficiency.