> “The results surprised us,” research lab METR reported. “Developers thought they were 20pc faster with AI tools, but they were actually 19pc slower when they had access to AI than when they didn’t.”

They forgot about training and practice. Try it with airplanes. "The results surprised us. Given Boeing 777 they thought they will get from London to New York in 7 hours, but they actually couldn't even get off the ground. In fact they couldn't even start the engines."