yeah, making it editable later (rather than when you start a new thread) is intended to make it more of a curation feature, and I think extending that power beyond the original thread creator makes sense, but of course it shouldn't be editable by anyone by default and it's worth discussing what the ideal UX may look like. This will tie into work on circles and custom boundaries: https://github.com/bonfire-networks/bonfire-app/issues/223
@dajbelshaw uhm... I tried to edit the title of your thread and I could. Unless I'm not getting the point, I think it's a strange behaviour if everybody can edit other users titles.