What's a "true" digital UI? If you're going to say buttons and tabs are skeuomorphic, what isn't skeuomorphic? Interacting with a CLI resembles the back-and-f

What's a "true" digital UI? If you're going to say buttons and tabs are skeuomorphic, what isn't skeuomorphic? Interacting with a CLI resembles the back-and-forth query and response of conversational dialogue: it's skeuomorphic too! Here's a question for you: what, exactly, is wrong with using metaphors for existing, well-known analogues to convey information in a new context? Isn't this how languages, notational conventions, and symbolic connotations naturally evolve among humans? I understand why people are tired of Apple's excess, but what's the problem with skeuomorphism per se?