To clarify; I'm referring to smallish startups with less than 15 people. If I were to count the number of times that chance encounters in the kitchen, lounge, common area, etc. resulted in ideas that dramatically improved the product, it's be in the 100's. Creativity needs time to ferment, and a catalyst to clarify.

Large enterprise corporations with dozens of people on the tech team and a rigid process? That's not a creative environment. Startups MUST foster a creative environment.