Decison what items to wear is always critical.
And there is a thing that Diablo 3 made somewhat interesting and probably worth implementing in Grim Dawn.
Give us a new equipment slot - Trophy.
Trophy could be any item but only thing you would gain from it is either counting it towards set completion or/and ability that item grants.
Or even inherit skill modifiers from it.
If you are hoping to get something like the D3 Ring of Royal Grandeur in Grim Dawn, I am gonna have to tell you: not going to happen. This would completely destroy every balance the game has. And the devs have truly worked hard on balancing it.
TL;DR: No!
Adding another item slot would just mean more balancing needed and the game is already a pain to balance with the current number of item slots. So, no, thank you.
I don’t think Diablo III has medals. Perhaps they should add medals. 
+1 to what the others said.
10/10 Horrible idea
It works for Diablo and doesn’t sound too bad but GD already is a pain to balance. Especially with upcoming Medal augments it’ll become even more of a clusterfuck
As I said, trophy item would only give Skil either passive or active that the item gives but not statistics, so not a Ring of Royal grandauer from Diablo 3 and more like Kanai Cube.
If that is the case, everybody will just go with cubing Mark of Divinity, no doubt.
Anyway, nice try on suggesting something, but you better come out with a complete plan to keep things properly balanced, and not just a random idea. Without proper balancing plan, no one will buy your idea.
TL;DR: Come out with a more coherent plan to convince the community and the dev, not a random idea with tons of drawbacks.
Why would you cube mark of divinity? Maybe in crucible 151+, but else? Why? There are much more fun skills around. Still, I’m not really keen on seeing all the additional balancing issues arising.