One should be taken literally in every circumstance, but the other shouldn't?
If I asked 100 people what it meant for a car to be "full self-driving," 99 would say it means the car could fully drive itself. The final one is too busy sucking up to Elon.
Taking your initial analogy, it's the difference between not sleeping well in the 787 Dreamliner, vs said Dreamliner crashing before landing.
I believe people are being overly dramatic and think they are entitled for Elon's overcommitment. I agree that Tesla overpromised and underdelivered. Meanwhile, I am happy to use and optionally pay for FSD as delivered. It is really an amazing technology and significant.