User blog comment:AnnWatson/The Values of Fandom: Balance/@comment-24687156-20161116154823/@comment-24510587-20161201222008

"We can't keep Forum forever, but we also won't remove it from existing communities until Discussions is at a place where it's a robust enough replacement."

You're also preventing a whole lot of new communities from being created, especially roleplaying ones, by not giving new wikis Forum. I made a wiki recently, called Rapture, which was going to be the culmination of months of work and preparation - only to then discover that I couldn't get Forum anymore, and instead had been given Discussions, which essentially tore apart a project I had been working on since Spring.