With illiteracy common for most people at the time, the oral tradition of reciting the classic ensured its popularity and survival through the centuries.
This not only ensured that as many pilots as possible advanced, but those that could not were still gainfully employed flying the aircraft types on which they had qualified.
This ensured that unauthorized clients could not connect and run malicious exploits (such as for monitoring network traffic or spoofing identities) against the network.
To avoid having the entire system go dark if a single lamp burned out, each street lamp was equipped with a device that ensured that the circuit would remain intact.
