Somewhat ironic that the people who can have the easiest time continuing to create actually lack the taste to know how bad they are and consequently don't actually get any better. I wish the idea would die, that doing a lot of something (10,000 hours or a million words or whatever) lets you get better. It doesn't. It's dispassionate criticism of what you've done that guides your improvement. If you do nothing but make shoddy dovetail joints for ten years and never ask why your furniture keeps falling apart, you're not going to get better.
And you can trust me on this. I have written ten million words of crap in random thread comments, so I know what I'm talking about.
Oh, I should add, I actually love that video and would marry Ira Glass, but his crazy dog, and wife, rule that out.