A conservative criticism commonly levelled at new words is that they are “unnecessary” – that we already have a perfectly good and proper word for whatever it is, so why introduce this needless alternative, this objectionable offshoot, this linguistic weed? Because god forbid there should be an overabundance of words. Think of the mess.
Traditionalists decry or resist neologisms they find redundant, those that overlap with existing words rather than fill an obvious gap in the language. There’s simply no need for it, goes the argument. And it’s not just words. New grammatical patterns get the same treatment: after writing about the innovative because X construction, I was told it was ugly and unnecessary.
An aside: Sometimes neologisms are distinguished from nonce-words, words invented for a single occasion or situation. Critics spare these because they’re disposable coinages and not seriously intended as additions to the language. Though sometimes a useful distinction, it’s not always a clear one; in the rapid everyday exchange of language, no one knows what will catch on.