As most of us are aware there reaches a point much like when you hit 5 stars, with items they are 100% unusable... Jonin Scrolls, Anbu Scrolls, Low Level Refines, Mediums etc...
Wasted spaced and they become wasted rewards in events at times and make it to the point where it's why play in this event outside of the exp for some people.
I suggest a system in relation to where we may upgrade existing items into the next tier..
Such as X5 Low Level refines= 1 Medium, x5 Mediums=1 adv.... Even by shop prices its more than it should be but is reasonable imo. And these can correlate to other items as well, such as scrolls, but obviously maybe make those higher being they are easier to obtain and farm, like 100=1.
I was happy to see our wasted fragments be turned into something positive and hope the same can be done about our upgrading system.