On the contrary, recent discussion threads show that we do know what we want.

"100 bloggers is not a market" is a common argument used to blow off any ideas of user participation in development process. It is, of course, true that 100 people do not represent the whole market. Thus, blindly following what these people say would be unwise. Nevertheless, when you have got 100 people actively using your product on the daily basis, you should at least listen to what these people have to say about the product. They are essentially testing your product for free, finding new use cases and optimal device configurations. Why not use their experience as one of input components during device design is not clear to me. For example, when active 100 users are telling you that they want a dpad, the chances are pretty high that the remaining N million potential users will also want dpads.