Why do people on SW post questions in random categories that have nothing to do with the post?

I was only on EP in its later days when things were not particularly working, but I gather that groups there were supposed to be actually communities of people sharing similar experiences. That has totally broken down on here -- as far as I can tell, by deliberate choices of the admins. At this point it is not at all clear what the groups or topics are supposed to be for. -- I disagree with those saying it does not matter. It would be great to be able to check in on a group concerned with experiences I share or things I care about, and know that is what I would find there. -- That does in fact work on Facebook -- but then Facebook actually has millions of users, whereas I agree with the estimate that there are maybe a couple of hundred people active on here.