There were several different components internal to Cloudflare that failed in a complex distributed systems context; the Rust failure is garnering more attention partially because it was a very legible failure, which also makes it easy for Cloudflare to fix this bug and all similar bugs quickly. The Cloudflare postmortem is a pro-Rust argument. It's also an argument that too many institutions rely on Cloudflare, which is a harder problem to solve.