Continuing the discussion from Recommendation against "qubes-dom0-update" (use "Qubes Updater" instead):
Post signatures, those little blocks of text and images attached to each post by a user as a form of expression, or mini-profile. Many forums prohibit such signatures outright, such as Straight Dope, and Stack Overflow. Others allow and even encourage them. Discourse believes rather strongly that signatures should be discouraged in any modern forum software, but certain communities may still disagree.
Their resasoning is they take too much space and the user information is all already right next to the post. So on the vanilla version of discourse we’re running it is not possible.