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UK government trial of Microsoft's M365 Copilot finds no clear productivity boost
(www.theregister.com)
This is a most excellent place for technology news and articles.
So use it for the tasks that were made more efficient, and stop using it for the ones that slowed down or were low quality.
I think they mean that the output that makes task X more efficient slows down task Y that uses the previous output.
If that's what they meant then it's bad writing.