Not sure if you are referring to OP's original intention in starting the poll, but, to me, it doesn't look like an attempt to gather a sample that could be applied to the general population by inference. I looked at it as an attempt to learn something about the members of this forum. And it does that despite the fact that, as you say, the participants are self-selected.
Actually, polls on the FIRE forum are indeed meant to start a conversation and they generally do.
It is interesting to note that a significant percentage of members (from this poll and from my general observations over the years) have pensions despite the fact that FireCalc is all about SWR's for folks retiring early "before pensions and SS!" When a member who I know has a significant pension/SS combo comments on withdrawal or investing issues I take that into consideration as I do for members who I know are living 100% off of their FIRE portfolios.
Edit: Re-reading your post and if I assume by the word "here" you mean the FIRE Forum, we're probably saying about the same thing.