I don't write all my stuff. Everybody always thinks that. But in just about every album I've ever had has been about 50-50 songs I've written or co-written and other people's songs.
You could argue that if the average golfer plays a golf course with 430-yard par 4s and they always miss the green, that's good practice. It's definitely great practice to play a course that's too long for you.
My uncle, who was a little more flamboyant, always said the guy who dressed the best was Fred Astaire.