I'd suggest the don't knows are also don't cares. They are not in it specifically for the music quality.
For the 51% - could be ill informed - or probably for many or most the expectation of sound quality is just one small part of the preference - the rest being all the reasons people have (repeatedly, over and over and over again) given over the last... *looks* ...393 pages.
If the preference is ill informed on one count, it may well be on others, including most of the other things that have indeed been raised over the last 393 pages.
I'm asking this as a question. I don't have the answer. And it is not meant as a personal slight on anyone here. In fact I've found when addressing newcomers here asking about how to get decent sound from vinyl or wanting it to include it in their first setup, that there is often something else behind that, for example an inherited or donated collection they want to continue playing.
But let's face it, there are plenty writing in magazines and working in hi fi stores that are absolutely pushing the idea that vinyl sound is superior, that you have to have ultra expensive equipment to play back vinyl properly, that you have to start with vinyl and then do the ultra expensive upgrade treadmill, buy all the other unusual items, and that every step along the way you will hit those revelatory moments of veil-lifting magic.
Well, smack me in the face if that isn't exactly the argument that ASR regulars go in for so hard with equipment... but vinyl is suddenly a "preference" and supposedly fine. It's still expensive and inferior, and people who prefer the high fidelity enterprise and an objective standard have a right for our views to also be respected in these parts.
Ultimately, the vinyl superiority lie sits at the heart of the industry. It's the first one that many newcomers to audio fidelity run into, and it appears to be the first that many believe. It's also the hardest to combat, because unlike cables and million dollar DACs and magic tubes and the rest, there are all those other valid reasons to have vinyl playback. It's also a myth that makes more sense to outsiders. And anyone who swallows that one is cued up for other things that "we can't measure", now ripe for magic cables, quantum fuses, resonators, special ethernet switches to make their digital playback a bit less inferior, and who knows what after that?
So... the expectation of sound quality even as "just one small part of the preference" is still enough that you should not be surprised when it is called out by someone here.
Of course - read again. I stated it was a preference, based on their biases. I did not say it was well informed, in fact or that it had to be. Or it can be well informed as in my case. Given that is a preference it doesn't matter.
If it's your preference... fine. Maybe try being a bit more confident in your preference and take a comment like the one I made a bit less personally.
However, preference does matter.
Another central myth from the audio media is that preferred sound equates to objectively superior sound, more generally: hence because cable x or ethernet switch y caused a subjective shift in reviewer or potential buyer z's listening on a particular day, it
must be because of cryogenic treatment or the audiophile fuse or some reduction in a special unmeasureable form of RFI (or indeed, a particular EQ treatment of the sound, or some other distortion of a type welcomed or allowed by quite a lot of ASR "objectivists" - why don't I add a few more enemies here while I'm at it?).
The problem isn't preference as such - but the ease with which too many people take that next step.