Not sure whether it has been raised before.
I wish there was a tag cloud on user profile page to quickly understand which categories is a particular user most active in? For example does he contribute more to “features” or “dev” or “bug” … category/sub-category on meta.discourse.org.
I think it’ll be immensely useful on large forums both for users and administrators. Yes administrators can gather this information easily from database but isn’t it better to discourage direct db access?