When I checked out an operator repo for some stateful services, say, elasticsearch, the repo most likely would contain 10s of thousands of lines of YAML and 10s

When I checked out an operator repo for some stateful services, say, elasticsearch, the repo most likely would contain 10s of thousands of lines of YAML and 10s of thousands lines of Go code. Is this due to essential complexity of implementing auto-pilot of a complex service, or is it due to massive integration with k8s' operators framework?