> Dictionary definitions are not formal definitions, they are attempts to capture usage.

But because they're "captured usage", they're generally what people would understand by the term.

Yes, but to use a term in a technically relevant way, it needs to be tied to reality; if not, it's just marketing jargon or pseudo-tech speak. The best technical definition for this case is not by how it is most commonly understood, but how it most commonly applies. Dragonwriter makes a compelling case in that it is most commonly true that a user won't have access to the specialized hardware required to "unbrick" the device.

Case in point: "literally" meaning both literally and metaphorically

I disagree with that analysis, incidentally.

"Literally" is often used when the subject is metaphorical, but that's not the same thing as it meaning "metaphorically". If you took the "literally" away, it would still be understood to be metaphorical - the "literally" is intended to strengthen. It's the normal sense of literally, used hyperbolically.

In the same way, when someone says "you left me waiting for days" we don't say that "days" sometimes means tens of minutes.

Soon, we'll only be able to communicate with "likes" and "upvotes" because words will have lost all meaning.