I know it should be charged if you have Displacement or Hardened Shield, but is there any benefit if you do not?

I searched and only found this post on the subject:

Quote Originally Posted by iacito View Post
Charged shield absorbs approximately 15% more dmg, approximately reduces 15% more dmg, and lasts 5 more second.
I did some testing, and a charged Arcane Shield does not last any longer. Is there any confirmation that it actually reduces more damage, or absorbs more damage?