I'm already, seriously, looking forward to the post-mortem. It kind of sucks when things break, but it is also really interesting to hear the gritty details. Hopefully they don't disappoint? Odds that is AI related?
You can search and watch videos directly with no issue, but main feed and suggestions on the side of videos are not appearing.
Really goes to show how much I depend on the algorithmic recommendations, I have no idea what to watch having to search manually. Usually my feed always has something that piques my interest.
If you are subscribed to channels, I really recommend using Subscriptions instead of home page. Otherwise, you may miss videos from your favorite creators just because YT decided so.
I mistakenly thought that YouTube hit a compatibility problem with my Firefox browser. The only breakage I could see was that the right sidebar of related/recommended videos disappeared. But I was watching several videos consecutively just fine. (I obtained video links from recent bookmarks, plus manually queued URLs of next videos to watch.)
Videos are streaming but the quality seems to be low; on a few videos I checked, format 136 which is supposed to be 1080p is currently actually only 360p. Possibly a bandwidth problem.