Monomania is what it sounds like: a pathologically intense focus on one thing. It’s the opposite of the problem you have if your gaze is ever flitting from your Tumblr to your spreadsheet to your baby to rush-hour traffic.
There is no such thing as a perfect working condition. The world is moving fast, technology is changing. You can get away and create in isolation but you risk losing the inspiration and random connectedness that comes from distraction.
Focusing on one thing is a nice guideline to productivity but it also stifles innovation. Sometimes you need to let the mind wander. The unfettered thought is the ultimate brainstorm.