le jeu est fait pour qu'on ait besoin d'utiliser plusieurs armes et armures en combo...

it's more about saving the "work" of after; when you take damage, you heal, which means more foraging and crafting... less damage, less.. of all that. you can get through anything intact even on VH with crap armor. all depends on how you play. a stealthy lives-in-the-tall-grass archer who only gets in and mixes it up when they have to can wear starting outfit the whole game, really, without dying more than a couple times.

Are there situation where this or that armor is more suited? I don't really see the use for say, the silk armors?

eh, mostly virtual photography and screenshots at first.

though most have an extra weave slot when they have no built-in defense, and on NG+ even one more, and if you grab all the big boost unique weaves up in banuk territory (and again on your NG+ run, by which time you'll also have unlocked ability to remove and re-use mods if you hadn't before) you can make some highly resistant and specialized "plain" armor.

引用自 Aleddra：

I pretty much only ever use stealth / melee armors. Cold or fire as needed but that's it. Should i be using other types of armor for something?

Sparkworker is useful if you are fighting a Stormbird. Most of their attacks, especially the air to ground stuff, are electrical/shock based.

Arrow Breaker is useful against human enemies, at least in theory. OTOH in most cases I'm sniping them with arrows from the bushes and using stealth armor. If and when things go loud? I'm too busy to remember to swap armors.

Sickness eater is nice for clearing corrupted machine zones.

OTOH with good weaves and resistance potions you can cover a large amount of this. Nora Stealth and Protector armors were my mains, with the Werak Runner and Chieftain when I needed a passive heal.