I did, through BuddyPress. Which then took them and shoe-horned them into groups instead of simply integrating them with the rest of the site.
In my 10+ years of social media experience I’ve never seen group-based forums that were successful at building community as effectively as ones that were configured in a more open manner. MySpace’s group forums, for example, are garbage. This is not the example anyone should seek to replicate in a social media platform.