Yeah the “not invented here” syndrome was considered an anti pattern before the agentic coding boom and I don’t see how these tools make it irrelevant. If you’re starting a business, it’s still likely a distraction if you’re writing all of the components of your stack from scratch. Agentic tools have made development less expensive, but it’s still far from zero. By the author’s admission, they still need to think through all these problems critically, architect them, pick the right patterns. You also have to maintain all this code. That’s a lot of energy that’s not going towards the core of your business.
What I think does change is now you can more easily write components that are tailor made to your problem, and situation. Some of these frameworks are meant to solve problems at varying levels of complexity and need to worry about avoid breaking changes. It’s nice to have the option to develop alternatives that are as sophisticated as your problem needs and not more. But I’m not convinced that it’s always the right choice to build something custom.