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
You should at least be able to volunteer for the beta. What if a large part of your content relies on some of the old features. What do you do then? Make worse videos and anger your subscribers until the features come back?