Did they ever decide if qunari wore armor like the codex in DAO said or are they wearing little to n

So far as the Qunari in DA2 were concerned, they had been in a shipwrecked, so any heavy armour had to be abandoned when the ship went down. However, they do seem to have persisted with the lack of armour in DAI, including the spoils of the Qunari item pack. I suppose it could be argued that this is because most of the Qunari we encounter down south are not engaging in a major assault as part of a war effort but covertly behind the scenes for the most part and the emphasis is on speed. The Iron Bull mentioned something about this, I think, and seemed to hint we might see something different if the Qun started a major offensive again. That said, it would seem from the comics that whilst they have armour, it is not the shining silver armour described in the codex in DAO.

However, since then they have introduced the idea of vitaar, that they paint on their skins that would seem to harden it or something and it is already meant to be tougher than human skin, so someone suggested on these boards that maybe the silver sheen that the enemies took to be metal armour was some sort of special vitaar. I don't subscribe to that myself because they were at war with the Qunari for long enough in earlier ages that I think people would have realised if it wasn't shining metal armour. So I think we may have to accept that the designers just changed their mind on that one.

That could also be an explanation. In fact, since we hadn't heard about vitaar before, it is possible that this was developed by the Qun since coming to Thedas specifically to reduce the need for heavy armour.

Armor also negates some of the force that a weapon hits with. Unless they are gonna say the qunari are far stronger and far more durable then humans to an extremem level then it won't work. A sword that hits you hard will hurt and even if it doesn't cut into you it will still hurt. Axes,maces,warhammers,and spears would be even worse. But why let common sense get in the way of a cool design. Again this rant is not directed at you. I love history and history has shown that armor was only abandoned when gunpowder weapons became dominate over everything else and rendered armor obsolete for centuries. Now we have kevlar and such.

Yeah, I also experienced a full 2h Bull making indiscriminate use of most of his health-draining Reaver stuff to be about as squishy as a rogue. Built into more Weapon&Shield style, it's okay though.

Funny thing is, while default Bull's armour pretty much looks like qunari Obelix, some higher-tier pieces have him sport a leather chestpiece or a metal chestplate which might come with pauldrons.

I usually get Iron Bull in this armour set, I wonder if actual Qunari Plate mail is similar? 

I would ONLY equip him in armor with a metal chestplate.

Who needs Boob Plate when Red Vitaar gives you Plate Boobs? 

There is an exchange between The Iron Bull and Dorian where Bull tells Dorian that if ever saw a qunari warrior in full armor to run because that would mean full scale war and he also IMPLIES that this is really the only time when wear full armor. It can also be that qunari have different armors for say warriors and say archers that would normally be in the back.