I have built a radically different system in general called Abject (https://abject.world). I have been thinking about how agents are the wrong abstraction and what an operating system can look like now that we have LLMs. It's not designed to help you with your website or app, but it does code and make different kinds of apps within it's system. In principle it should also be able to code apps outside it's ecosystem but I haven't tried that in any serious way.