The point is that "In the jungle" etc can actually be reliably remembered by a large portion of the population, whereas 16 independently chosen letters/numbers/symbols usually can not.
Humans are great at remembering phrases, quotes, etc. Think about how widespread referential humor is, where the joke is just a reference to/quote from another work. That's something the brain is great at. Random or semi-random jumbles of letters? Not so much.
Humans are great at remembering phrases, quotes, etc. Think about how widespread referential humor is, where the joke is just a reference to/quote from another work. That's something the brain is great at. Random or semi-random jumbles of letters? Not so much.