I think this is because a lot of people think more is more. Wow look at all the detail and bullet points! No one on the receiving end actually wants that though. When I use AI to write, it's to boil it down to the minimum bits needed. I wish more people would use it that way.
It's the empty calories of literature. More would be more if there actually was more but AI writing is making it bigger without adding anything actually more. It inserts loads of fluff and repetition that takes longer to read but doesn't exchange more information or ideas.
I always have a strong hunch that it would be vastly more efficient if they just sent me whatever the prompt was, rather than the output. If you blow 2-3 sentences of intentional information up into a verbose e-mail, you're needlessly wasting both your and my time. Just send me the 2-3 sentences of actual stuff!
Meh. Just this week, I've had two Sonnet 4.8 agents generate, in parallel, a 2000 line wall of brittle bullshit, and a well architected solution with 20% of the amount of code, to the same problem, from the exact same initial context, and very similar prompts. Come on, they can do poor quality work too.