Cite?
The research stuff?
It came up fairly early in this film series, I forget which episode. IIRC it was a bit of a throw-away when they were talking about satisfaction for the Fighter and Druid. Paraphrasing: 'We read forums a lot and they don't match our research, which surprised us.'
Mike Mearls and Rodney Thompson | DigiPen's Student Senate Speaker Series
https://www.youtube.com/watch?v=sJqQQ2r7O2w
I think the whole thing is worth a watch. They're really open about their process.
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The 'full of dour, argumentative sourpusses?'
Here's a great example
