4x is a number I pulled out of thin air. I'm not sure I even yet believe there is a net positive effect of using AI on productivity. What I am sure about in my own workflow is that is saves me time writing boilerplate code - it is good at this for me. So I would say it has saved me time in the short-term. Now does not writing this boilerplate slow me down long-term? It's possible, I could forget how to do this myself, some part of my brain could atrophy (as the MIT study suggests). How it affects large teams, systems and the transfer of knowledge is also not clear.