When you’re obsessing about one thing, you can reach insights about how to solve hard problems. If you have too many things to think about, you’ll get to the superficial solution, not the brilliant one.
The irony, of course, is that both Blogger and Twitter started as side projects. If I had been absolutely focused on the main project, they might never have happened. So, there is something to be said for knowing when you’re locked in to the right problem.
To me, that comes down to the gut. The things that keep nagging at you are the ones worth exploring.