https://support.google.com/youtube/thread/2494861?msgid=2520468 … I have never heard of a web site removing a piece of functionality, so that its developers could do work on their side. (YouTube filters and sorting do not work, so they can moderate videos better? How does that help anything?)
Bonus points for not communicating this temporary disabling of said functionality to the users. C'mon @YouTube @TeamYouTube you know better.