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 will be happy to know I’ve been using the new since it came up and to be honest I don’t have any issues really! A couple of teething problems but I still get my videos up, I still get subscribers and my viewers see my content 
Classic was good, new is goodpic.twitter.com/jWsqTkGTQ7