Had a clueless business analyst get Copilot to write a bunch of stories for an epic, then when she had a meeting with me (and three other people!) to go through the stories I had to tell them that 90% of what they had done was wrong.

If they'd come to me from the outset I could have told them the one story title and handful of acceptance criteria that was required but instead we wasted 5 person hours and whatever Copilot costs.

Probably worse productivity because now I have to read paragraphs of emails that could have been sentences.

We've lost customers over the increased price.