1) it may sound blunt, but users often don't know what they want. Henry Ford nailed it by this quote: “If I had asked people what they wanted, they would have said faster horses.”

In fact, my original idea is to ask to people what they are, what they do, what they use, what they know, and what they like(?), NOT (at least not exactly/directly) what they want.

But, BTW, a car IS a "faster horse". Isn't?

And I would be happier if populations worldwide promoted effective public transportation, instead of flooding streets with cars (and social isolation, and non-stopping capitalism, and [...]) - especially cars with 5 available seats and just 1 used.

2) the users who take part in this survey are not usually a representative sample of the whole user base. For example my parents are long-time Fedora users, but they would never participate in such surveys, does it mean they should be thrown overboard?

I think I didn't make the idea all clear, so, of course, it's OK to see it this way. But, to be fair, my idea behind the "Official" word, is to heavily promote this survey (in the downloads page, Fedora Magazine, whatever) so people can, at least, collect a bit of useful information about a (small?) set of the (participative?) user base, knowing that "this" means "this" and represents exactly "this", and stopping making such guesswork in random places (Distrowatch? Reddit?) and random data (downloads statistics? results from independent blog surveys with non-caring people and "void" questions?).

I was thinking about it yesterday, and came to the conclusion that this idea is way more about a "database" than about a "survey".

It's important to listen to users, collect user feedback, work with it, but I think some formal surveys would shift it more to voting "Do you want A or B?" ... hey, A won, how come you goddamn didn't go for it? ... and that's not a way to go IMHO.

I understand that a "survey/database" may not be a useful thing. But your initial assumptions about this idea were a bit wrong. Do you mind writing your opinion again but now based on this little clarifications?