I know forums are in opposition to everything that SE stands for, but for quite a lot of cases the questioner would benefit more from a back-and-forth, or open-ended discussion, and then at the end of the process if it's been refined then turn it into a question. If not, then let the thread auto-close and maybe even expire into deletion.
Also, any SE equivalent needs to understand the power dynamic between questioners and answerers, and what motivates people to put in the huge volunteer effort on which it's built.