Hi, author here. FWIW, the only people I coordinated with are my colleagues at exe.dev. Philip wrote a blog post a week ago on the topic too: https://blog.exe.dev/customizing-shelley. In retrospect, I should have sent drafts of this to other people I know thinking about new dev tooling to get their feedback! A bit more private discussion could have let me polish this more.

We are all busy discovering the shape of new tools and norms as our profession has been overturned by LLMs. It is not too surprising similar ideas are floating about. Though I have not seen anything that captured how I now go about personalizing programs, and how I expect it to change our industry. So I wrote this.

exe.dev haters abound, apparently