User blog comment:Cristina7/Introducing Discussions, a New Platform For Engaging Your Community/@comment-27395978-20160908181308/@comment-18172179-20160909003425

The main concern is that Discussion users are not interested in content-editing. They come to socialize. When you propose to get rid of an actual useful feature for content editors (like Special:Forum), you're hurting the wiki, no matter how many newcomers who want to "discuss" join.

I know from first hand that the wiki community and the discussion community are two very separate things. And no matter how much effort one makes, they're not going to merge as easily as the Forums will when they are forced into Discussions.