And note that the call for survey takers was posted in /r/dndnext (39,000 subscribers), and not in /r/rpg (110,000) or /r/dnd (200,000).
That probably limited their potential viewers a lot. Even though it was for 5e DMs, from the numbers, I'd think that many 5e DMs look at the other two and not /r/dndnext.
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