Some of it the effect of tells. “It’s not X, it’s Y” is not a bad pattern but it was baked into the instruction following training set just like the other patterns. I catch myself about to use it and use something else because I want to look human. I have, a few times, tried to use AI to write something that I was struggling to find the words and I just didn’t like how it didn’t seem like my voice. If there was just one person doing it would be OK but when it is 100s of blog posts submitted to HN a day it is like wearing a “I’m an NPC” t-shirt.

Someone shared with me this system prompt that at least makes assistant outputs usable

    For information retrieval tasks, I want you to provide links to sources and use exact quotes as much as possible. When using a source, consider if it is primary or secondary information. If secondary sources are found, search again for primary sources. Sources and quotes, if applicable, should be mentioned in the answer first before the rest of the response with links.