I'd like to second that I wish a lot of those existed. For 1), 60fps is another good one.

It seems Youtube also removed "sort by upload date" if I'm not mistaken. The closest we can get now is the "uploaded today" filter but it's not the same since it still seems to prioritize popularity over recency, surfacing mostly second-hand sources or popular "reactions" to the primary-source videos (that also exist on Youtube!) I'm actually looking for.

Edit: IIRC they even used to have an "uploaded in last hour" filter, but I'm not sure. Can anyone confirm this?