Ah, ich sehe, Sie sind auch ein Mann der Kultur

You can import things from YouTube, but I don’t use recommendations so I can’t answer that

Yattee is the best app ever, it is a little buggy here an there but if configured right it can do the same things as newpipe or vanced on android

Freetube is great, its my main way to watch YouTube on Desktop. For iOS i just found yattee. If configured the right way its basically newpipe for iOS