It's been an ongoing thing for a while now. PvP heavy hitters that have been that way since it launched like giratina haven't had anything noted in their pages for example
Personally, I feel its there just too much that's come out (new raid guides happening and updated every other week lately, new events and research tasks, the move pool expansions, and CD articles, plus others) and needed to be done, as well as going back to most pokemon's pages and editing them is a large endeavor.