It's almost 2020 and you still have to return to the old @YTCreators @TeamYouTube website style when you hit Customize Channel or to alter any playlists..
And they wonder why we're apprehensive about a new dashboard. That'll likely never be complete either ¬_¬
In one of those Youtube insider videos they mentioned that slowly over the next few months (I believe) they said they would add the missing features piece by piece.