The ecosystem is fragmented

One example to illustrate why Go is so great for backend services is that the Go services I'm working on don't even have a reverse proxy / load balancer in front of them. Thanks to Go built-in TLS and ACME (Automatic Certificate Management Environment), they are directly exposed to the internet, something that may not be possible due to the complexity of wiring together rustls and axum and ACME. Small details like that compound fast and considerably improve the deployment, management and operation of your backend services. Hey, even UUIDs are coming to Go's standard library.

Also async Rust will waste your time compared Go and your CI/CD pipelines may take 10 times more time (e.g. 4 minutes for Go, 40 minutes for Rust, for a service of the same size).