IMO my opinion... If you tossed a brain dead patient into a large room full of unconscious ICU patients it would be incredible hard, if not impossible, for any lay person to single her out.
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And that's why there are highly trained and experienced physician specialists and expensive highly complicated equipement, and validated documented criteria to distinguish the functional levels of "unconscious ICU patients".
If we didn't need this kind of expertise and investigation, I guess we could have the janitors or hairdressers deciding on care and not need all those expensive physicians and ICU nurses.....
I'd like to also point out that there a probably 157,000 medical diseases that are not apparent to the lay person and that's why we have physicians, examinations, laboratory, functional, and imaging testing......