It’s actually curious how does one arrive at the idea of using plants like that in the first place, when they are an early human or an orangutan. Probably at first, they just applied random plant matter to cover up the wound, or chewed plant matter to cool it down (it will keep moisture for longer than water). And then noticed that some plants are actually more effective at that.

he cares for his health more than I do for mine.

Given enough time, other species may evolve and perhaps teach us a thing or two about being better civilized beings.

My money is on the octopi people.