Daunting complexity or trash 80lvl (Horizon: Zero Dawn)

So. Pouring 9 points in silent running was extremely indignant that he just doesn't work on this difficulty. While anywhere about that I did not say. 3 skill to him at all useless (I suspect that they don't work). What other stupidity keeps this complexity? I'm kind of resigned to the fact that I notice the mobs in the floor map, it's okay. Let. Hardcore here and there. But non-working skills? What other surprises? And how to get out of the situation with the fusion glasses?