I think it's more about being on display. In an open office you are on show and must look like you're working. This is hugely counter-productive, as you can't e

I think it's more about being on display. In an open office you are on show and must look like you're working. This is hugely counter-productive, as you can't even have a comfortable "pause for thought" without someone assuming you're taking it easy! I remember feeling super tense at my desk because of this expectation to look busy. In a coffee shop, you can be more relaxed, enjoy the environment, enjoy the hustle and bustle and dip in and out of intense concentration without caring who's judging you. It's just a more natural way to be and allows you to think clearly with a nice rhythm. Needless to say, I have spent a number of very productive hours in the coffee shops of London!