I think you misunderstood what I meant (and I failed to check the surrounding language to make sure it was unambiguous where the quote was from). I was referring to you saying (emphasis mine)

> But indeed the author could do a better job with the text. One of the very basic principles of technical writing is to always introduce the definition when an acronym is first presented

and saying that no, not expanding the acronym is not always a mistake or sign of inferior writing.