Healers not dpsing is not an issue it seems.

[Kitfox]

If that is the case then the threads outlining healers not doing damage is also not relevant.

Healers not doing damage is a logical game mechanic argument, not a statistical representation argument. Your argument is that not doing damage is not a major issue because players are tolerant of it in casual content. It doesn't change the fact that your empirical sample group is entirely too small to draw any sort of conclusions. In my opinion, you're even right in your hypothesis, but your "research method" is entirely lacking in verifiable principles, which what you're being criticized on.