Their problem isn't serverless, rather Cloudflare Workers and WebAssembly. All major cloud vendors have serveless solutions based on containers, with longer managed lifetimes between requests, and naturally the ability to use properly AOT compiled languages on the containers.
At that point, why should I use serverless at all? If I have to think about the lifetime of the servers running my serverless functions?
Usually a decision factor between more serverless, or more DevOps salaries.