In a few weeks, 1% of creators already using YouTube Studio will no longer see the ‘back to Classic’ button – you’ll be notified 1st & can still access Classic features you need! This won’t apply to everyone else until early next year. More info → https://yt.be/help/a7mG
Why not wait until all missing features are implemented? I shouldn't have to repeatedly go through a "why don't you use this" box to access playlists. The new Studio will be a great thing... when it's done. There's no reason to force a beta on folks that can't use it.