I think your poll would be more informative if you phrased it by how many dpo, not what cd. Not everyone has the same lenght cycles. I conceived ds1 on day 70-something and ds2 on day 80-something of my cycle.
I think the post would've been better if you'd asked how many DPO it was, not the cycle day. For example, I ovulated at day 26, so even if I'd have gotten a positive at 9dpo, it would've been CD35, and you would've thought that was really late, kwim?
I agree, everyone's CD won't match DPOs, y'know? With ds2 I conceived 1-2 days after a weird post-BC pill heavy bleed so technically I was only on CD 18 or so when I got my BFP (but about 11DPO). With my current pregnacy, I didn't ovulate til CD 21, then got my BFP 10 days later.