But that's implying that working at Google won't be as rewarding. There's a lot of pressure to execute and iterate and so on when you're doing a startup. People sometimes forget to sit down and relax. Being in a less risky, less stressful position at Google can give you the important insights you need when you really start your business.

I also submit that it'll be easier to quit Google when you've discovered your home run idea than to change your entire business.