If all your project design happens in conference rooms that can be pretty bad. In five years' time people will have no idea why or how a particular decision was taken.
Serious question: Is anyone actually able to point to a five years old conversation when trying to understand why a decision was made in most any projects out there today?
I can't check how far back they go right now (site blocked where I am), but yes, I've found IRC logs from a number of years ago useful when trying to understand parts of a couple of OSS projects I contribute to.
