"Triage by Time" means that the most hurtin' patients die anyway, often before you can even get there.
A chart of survival versus severity (or Mycrofft's Hero Ratio):
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R is survival (least on bottom, up to most on top), and S is severity (most on the left, least to the right).
So the majority of heroic saves will be those within a very narrow zone, minus the ones you are unable to treat properly due to many factors (ignorance, lack of capability, absence of proper history or exam, something breaks, transport time takes too long).
Want to save lives? Educate patients and people about safety, and how to perform first aid. Be a lifeguard for rescues.
or a garbage or sewer person. They save lives. Hundreds of millions.