Raw sockets are the strcpy of the current age of terribly-written distributed systems. People stand no chance of finding bugs in the systems they create on their own laptops. The fact that slow, incredibly low bug:cpu cycle black-box partition testing is so successful in finding bugs should be a screaming red alarm that we need to write our systems in ways that are more amenable to testing on our laptops in the first place.
That means having a pluggable transport layer that can be used with real sockets in production, a simulator that messes up traffic according to the asynchronous network model, or a hit-tracing fuzzer. If you’re using raw sockets in your core serving logic, your architecture is broken, and you will have far more bugs and higher costs to fix the few bugs you discover.