Okay, this sheds light on the problem... Yes, actually, I read the Incubator as being the starting point for "birthing" new communities. Not only from within codidact but also from the outside.

If not in the incubator... where else?

I considered adding a proposal first as a formality, as a first draft. Since the one person that can make a proposal will surely not have produced the final thing. But how should the final proposal evolve if there is no opportunity for people from the outside (you named them "consumers", that is fitting I guess) to join in?

That there are not only fans of such a community among people already on Codidact is clear... but if they do not endorse at least the idea of creating something "new" and instead only downvote... then "how" is this supposed to work?

Currently we are at least 3 invested people on Worldbuilding. One of the existing members showed interest. I think there will be not really more coming unless this is visible to the outside.

I understand that asking really anything is not the intended use case. But asking anything about a topic in proposal state is the intended use, right? I did not mean anything else but the latter.

The problem I have is that trying to "flesh out" things with members that are not really invested into the idea of for example Worldbuilding are not helping with their concerns. There should be a fence around the "community in the being" so that they can discuss among them. I envisioned a site for that purpose. But the info I got was that this is supposed to be done in the Incubator.

And here I stand now. Also in the wrong place apparently.

In the example of Movies&Literature this is the same thing. Yes, "queries for lists of opinions about movies" is not a primary goal of sites on Codidact right now... but what if the Movies&Literature community-to-be decides to make a section about "movie recommendations". Such a post could be a starting point. Well,okay, maybe I was 3 steps ahead.

I didn't mean "only people who are already on Codidact". We need to attract more people to all of our communities. Building communities is kind of a specialized activity -- yes, of course we want people interested in worldbuilding to come help build it here, both people who are already here and people who create new accounts to participate. We also want people who are interested in software development or EE or Judaism or code golf to come participate in those communities that already exist.

Most people are not interested in "all the things", just certain communities. Because the incubator serves all current proposals (dozens at this time), an unfiltered incubator is a poor entry point because it looks like "all the things". I encourage people coming to the incubator for a specific proposal to filter on that tag, and now that it's come up, I'll try to make sure that guidance is more visible.

If the Movies community decides to explore recommendations, that's cool -- best thing to do, since it's out of the norm most people expect, would be to start a discussion on meta about it and then ask some questions in the incubator and link them to that meta discussion. Try out the idea, along with the meta discussion of the idea. The community might decide that recommendation questions aren't a good fit but reviews as blog posts fit well, and again, that can be tried out the same way (meta + posts). We enabled the article post type to allow communities to try out blog posts, resource lists, and other supplements to Q&A.

I tried another take on the topic in Meta as you suggested to start a discussion first. Maybe this way something can be started.