This is a binary poll so it is really not going to get any nuances, but ultimately I read "true" as the "levels matter" answer, and whilst that is certainly true in old school, I don't think it is only an old school answer.Yeah, exactly this.
Also, mildly humorous that the poll switched so hard toward "true" over the time since I voted. I had been mildly surprised to be in the larger group. My surprise is now thoroughly gone. It's pretty clear that there's a strong old-school style preference on these boards, even if there isn't a strong old-school system preference per se (such preferences absolutely are represented, but the preference for the style vastly outstrips that for the systems specifically.)
A lot of other games often don't have levels or similar power progression than D&D, so I think it is rather natural if to a lot of people that progression being a big deal is strongly associates with D&D, and thus being seen as one of its defining features.