The real question is if we should expect their to be evidence behind it. And considering the funding, the opprotunities for research, the difficulty of doing a

The real question is if we should expect their to be evidence behind it. And considering the funding, the opprotunities for research, the difficulty of doing a study someone won't easily pick apart, and the community push to verify it at a peer reviewed level, I am not surprised we don't have peer reviewed research. For starters, I've yet to see a good way to measure productivity.