We have the same principle in French with (so learning Ihr in German was easier!), but frankly this is a reason why I prefer working in an english professional setting. Some people, generally older, get offended if you ever use the ‘du’ with them. But some others will want to look shill/younger and will get offended or mock you if you use ‘du’ with them. So yeah, using “you” to talk to the queen, my boomer customer or my nephew makes it so much easier!