With AI, I've tackled lots of personal projects I had on the back burner for lack of time: recreating some old games, creating some marketing and shopping sites for the wife and also professionally: using it to fulfill business requirements. So in my little corner of the world it is being used and a lot mostly nonstop from Aug 2025 to present. Re your question: I think it has to do with all the rest of what's needed for a production system, the documentation, CI/CD, production deployments: all those pesky still-needed-human-things that are somewhat tedious to set and get correct.

We get a few not infinite. with a Claude 5x Max subscription I get 3-5 workable parallel agents that themselves spawn subagents to complete work in a ~3 hour window before tokens are spent. I imagine with 20x Max that could be increased to maybe 10 within a 5 hour window? so if you want infinite you're also talking infinite money. Working in parallel takes me personally to a higher plane of output than that of a 10x engineer as it pertains to fulfilling requirements.