User blog comment:MisterWoodhouse/The first migrations to the Unified Community Platform/@comment-208.65.22.196-20201021165219/@comment-24006128-20201021165646

Every single wiki in good standing on Fandom and Gamepedia will be migrated. Right now, 61% of monthly pageviews are served by the new platform and we'll be at 90% in a matter of weeks, with 100% in sight for December or January.

The OLD STYLE is 8 years out of date and unable to be reasonably updated to factor in security fixes and other platform-level improvements from the Wikimedia Foundation. It only worked well based on the sheer skill of the engineers holding it together. The NEW STYLE (UCP) will allow us to stay up to date with new software updates, be more secure, and provide a stable foundation for building cool new features, rather than spending most of our time trying to reverse engineer fixes we would otherwise get packaged with updates.