I can agree with those points. Should be some kind of bonus requirement. But remember things like obi's and gorgets already have you questing and farming them. So there's some work to be done.

As for the point about DNC feet for example. Yes jig duration and step acc are two diff beasts, but to turn 2 pieces into 1 so it can be used in both macros would save inv (by 1 in this case). Again, another quest to combine them with currency/gil/crafting item/etc. But if you didn't already have the +1 feet, would you go do limbus to +1 them if you could combine them with relic? with emp? If the answer is yes, it breathes new life into an older event which seems to be what their doing now anyway.