I've personally been on many outage troubleshooting calls that cost hundreds of thousands of dollars precisely because engineers believed they could ignore the

I've personally been on many outage troubleshooting calls that cost hundreds of thousands of dollars precisely because engineers believed they could ignore the underlying details and corner cases of TCP. My favorite common mistake is that developers assume they can open a single connection with no retries and that connection will be reliable as long as the handshake succeeds.