I think the issue Brohg is referring to is that luck has "buckets" within which its affects are the same, rather than having linear returns. Those buckets are 1-9, 10-19, 20-29, etc., with 60 being the highest luck currently achievable. Having 40 luck, for example, gives the same benefit of having 49 luck, whereas having 50 luck brings you into a new bucket. The Fate's Accumulator charm aug goes up to 10 luck, and that pushes you from the 50-59 bucket to the 60-69 bucket. If charms don't have 5 luck (I believe they max at 4 if you have the evolving items), there's no difference between having 1 luck and 10 luck on that aug. There are 10 slots with luck, which puts you at 49 if your charm has 4. Adding in a Fate's Accumulator with 1 luck puts you at 50, and adding in a Fate's Accumulator with 10 luck puts you at 59. Those values are both within the same bucket, and as such there's no benefit to maxing out your Fate's Accumulator. Now personally I think the items should have type 3 slots and charms should have 5 luck with them equipped, but if Ngreth wants there to be a tradeoff that's fine. I do think maxing Fate's Accumulator should do something for people who are using the evolving items, though.