The only problem is that players will quickly find the most efficient set-up and then that will become the only way anyone does Grifts and they will all pretty much be the same thing over and over.
Isn't the loot of the cubes assigned as you get the item instead of when you open it?
I believe this is still a matter of some debate. I know I have heard of people earning caches on their main and stashing them for an alt with a different mainstat and the alt hets useful items.
I have also seen people copy characters to PTR with caches, and opening them yields totally different contents on live and PTR- Though you can't really judge based on that, you would think that if the items were, in fact, already determined they would be the same after you copied your character to PTR.
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I like it. I'd love to use it.
The only problem is that players will quickly find the most efficient set-up and then that will become the only way anyone does Grifts and they will all pretty much be the same thing over and over.