[pracer]

> But I would imagine it's far slower than doodling on a napkin with a colleague during break.

I think you overestimate how much relevant these napkin innovation situations are. Talking with some coworker and drawing something over a napkin doesn't mean the idea will be revolutionary at all. Or even useful. It is most of the times, a romantic image that make people feel like the smart innovator they would like to be.