"Imminently dying" or "neurologically devastated" are so hard to prove, not bright-line designations. Who has not known stories of people who were thought to be virtually dead, who rallied, sometimes for years more of life? How "devastated" is enough?
Granted, we have mechanisms for deciding when to "pull the plug" now. But it is hard enough to determine when someone is "dead," let alone trying to decide if that person is sufficiently nearly dead.
Close counts in horseshoes, but not in dying.