I wonder if there is a reason, why this forum has no tags. It looks like it’s a base feature in Discourse (maybe added after this Discourse was created):
I think tags can help us to better organize topics and it might help theme and component maintainers to tag “their” posts (posts about a specific theme or component) and organize them better. Also helps organizing topic groups deeper. Think of stackexchange and sites like that. Tags like css, algolia, image-processing, and so on and so forth.
I understand that the danger is high that people create chaotic tag structures. But that might be maintainable by the moderators? Or maybe (if that is possible) set it up so that a new user can’t tag without having a certain quality grade?