I'm not an anthropologist, but it seems so many cultures have these "tests" that are more like dares with a random chance of success. Is there some deeper meaning or ulterior motive behind them?
The first one is so big we see the ripples in our own culture. Most of the political arguments we've had in our life come down to disagreement about this one issue: should there or should there not be more people like us, and fewer people not like us?
To that last point, IIUC, the role of navigator was HUGE. Like a combination Pope, Stephen Hawking, and Grand Vizier . . and they ruthlessly kept their knowledge in a tiny esoteric circle, to control the means by which new lands could be found. Also so they could be the first to leave when things went bad, as they do when colonizing tiny islands in the middle of nothing.
[1] Literally tougher, skulls were thicker, but also "tougher" as in "eh, yeah, had this spear point lodged in my spine most of my life, no biggie"
"Archaeologists have determined that even the most remote Pacific islands were inhabited by human beings long before the advent of modern navigational techniques."
Yes, islands over vast expanses were inhabited... and it's a testament to many things including navigational prowess... but even today many remain "deserted islands"
Point being: What was once acceptable may not be now, thus inhabited then and deserted now. This also doesn't even touch on resource depletion (see book "Collapse" [0]) or the impact of colonialism on indigenous people.
[0] Collapse: How Societies Choose to Fail or Succeed: Revised Edition https://www.amazon.com/Collapse-Societies-Choose-Succeed-Rev...
Also: where is the hyperbole?
No but seriously, this is a (harsh) but effective way of weeding out those who didn't study for their "drivers license".