Oh so this is the thing people keep saying they want to fuck

the armors made from it have good stats for improving dodges

Canonically, the big monsters are invasive species and you need to hunt them as a means of population control, but also you get better rewards for performing catch-and-release instead of outright killing them sometimes so who the fuck knows.

Nargas' weapons are a great source of early-game crit and the armor on top of looking cool, provides evasion skills that are really useful. I love nargas roar so much, very much just a cougar roar or other similar big-cat. Iirc Narga is one of the early villians in MH Stories?

Narga's weapons are consistently good (high sharpness and crit chance, very good in games where raw damage+crit is the meta), and its armour gives skill points in increased critical hit rate and easier evasion

But also Monhun suffers from a pretty heavy dose of gameplay-and-story separation in that lore-wise, the repeated hunting of the same quest isn't a thing, and if you read the quest descriptions, at least most are fairly reasonable "this monster is causing trouble in some way" ones.

Though a few are pretty silly, like "My husband's got insomnia. Over the years, I've tried knocking him out to get him to sleep, but it turned out that's not a great idea... So I want you to capture a Malfestio to hypnotize him!" from Generations Ultimate. Malfestio is an owl-like monster that among other powers can put you to sleep.