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Not OP, but I am guessing they have domains like fordcareers.com or fordsecurity.com instead of careers.fore.com or security.ford.com, etc

Exactly what they did in many instances.

This really grinds my gears, way more than it should for some reason.

Use the system as it was intended, people!

Far from the most frustrating thing they did, trust me. I could tell you stories for days and never run out of more frustrating anecdotes.

Sometimes you don’t want everything hanging off the main domain, because if DNS gets horked everything goes down.