I have a shield on my back... but at the same time I have not?

Yo.

After finishing the game to Act.1 cruel and starting a Warrior now, I noticed the subtle differences of physical equipment, so to say.
Meaning... for the first time I have a reason to use both weaponsets and also use the weaponskill-points, apparently.
( Are they usable on the witch or am I just too stupid to figure it out? )

Anyways...
so I have a shield now and since I use a twohand mace I use it only as a shieldbash before the system auto-switches back to my mace.
Nice how fluent that goes btw. and that I do not have to use 'X' to do it.


And here comes the "problem".
When I have the shield in my hands, my overall armor scaling goes up. But it disappears when its on my back, which makes no sense.
Likewise it makes no sense that my back takes the same amount of damage as my front when I carry it on my back.

https://youtu.be/dHHaKtVdfa0?feature=shared&t=74

So I would like the team to fix that and if only so that everyone will now equip a shield on their back in their second weaponset, to gain a passive boost for armor and everyone looks stupid doing so. =)
Or looks cool... in regards to individual taste.

It won't boost the overall value's that much anyway.
But I think it is a wasted opportunity for a small buff.
I am carrying this big, hulking shield on my back that covers my entire back and it only gives me a buff when its in my hands and not even when it is on my back?
Feels kinda goofy and nonsensical.