It's definitely gotten worse over time as well. Looking at older README files I generated using Opus/Sonnet 4.5, its actually quite shocking how clear and concise they are. Whereas eg, Opus 5 will write paragraphs and paragraphs about random things I prompted, or a partial solution that was then scrapped for something else.
My theory is that the increasing strength in performing long-context tasks has led to this particular quirk.