User blog comment:MisterWoodhouse/The first migrations to the Unified Community Platform/@comment-5456782-20201031015555/@comment-50.83.177.147-20201031050315

Security is a BIG reason for this upgrade... Also, ease of development, they no longer have to implement all new features by themselves. Custom JavaScript means there can be more interaction in the webpages themselves. The removal and Overhaul of these services are due to the inability or difficulty to port the current implementations over. Of course, the other option for them is to let the site become a vulnerable exploitable mess to the point where they have to shut the entire site down permanently. This recently happened to the Unreal Engine 4 Developer wiki provided by epic games.