Is there really such a thing as a "low-tier" Primal? I mean, primal fears are primal because everyone innately has them to some extent. And if you ask me, falling is way scarier than the dark, on account of being nearly as omnipresent, often being much more pressing in the moment, and often not being as readily used in one's own favor. For an example of what I mean with that last one: someone partaking in guerrilla warfare can be afraid of the darkness cuz that's a fun omnidirectional place that people with knives sometimes jump out from. On the other hand, you can also be the person with the knife jumpscaring an unwary fool. If you fall, though; that usually means you got dropped into a punji pit and excruciating pain and imminent death are soon to follow, have fun with that.