Completely useless isn't the correct framing. Not worth the cost is a better one. The cost to writers whose work was stolen. The cost to the environment as emissions sky rocket. The potential legal liability if incorrect advice is given. I'd recommend pivot-to-ai.com for a good analysis.

Every time someone mentions using "AI" for office tasks, I picture them firing up a two-stroke gas-powered engine to write an email and they should too.