Millions of people want to be in the NBA. But only 500 or so people each year have what it takes to be in the NBA. And you know what? Half those players are on the bench all the time. This is how everything works and odds are that you aren’t talented enough to make it as a writer, a top-tier surgeon or lawyer, entrepreneur, or whatever.
You never “clock out” when you’re in grad school. I mean, yeah, you have to go to seminars and everything, but in general you pick your own seminars which is kind of like picking your own hours. There’s no time sheet, and you don’t have any jealous co-workers monitoring where you are. That sort of freedom is priceless.