> There's a belief - that's a myth - that if 3 ppl is good the 6 is twice as good and time will be cut in half. I think we also know - with rare exception - that productivity slides as heads increase.

This goes back to Brooks and has been true since longer than most of the programming industry has been alive. I do wonder why people are so resistant to learning from the past and just assuming "the way we do things now" must be an improvement.