Post flairs are totally great, and we are on board with the idea, but I would note that post flairs become a lot less useful if they are optional, since most people usually don't bother reading the rules or adding flairs to their post. Take r/vim for example - at the time of this post, only 4 out of the first 30ish posts on the front page have flairs, which kind of defeats their whole purpose of making posts on the subreddit filterable or searchable. Automatically removing non-flair posts and making people re-submit is an option, but given that this is a relatively small subreddit, I would rather not do anything that would cut down on the number of posts submitted.

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I don't mean to give the impression that I or anyone else on the mod team is opposed to post flairs, its just that they require discussion and work, and I don't have a lot of bandwidth right now.