Web.dev looks incredible for educating web developers, exposing Lighthouse to devs who aren't already familiar with it, and for automating basic website testing over time. But it will be a nightmare for support teams working at any kind of web service. As Google doesn't provide support for this tooling and site owners invariably fixate on the scores it provides, product support teams for everything from WordPress the…
All audit tools make recommendations that many of us will ignore. I have zero intention of using webp images for example.
I don't think your claim that "nightmares" will happen is warranted. Shiny new site audit tools are fun. Enjoy it, there's no nightmare!