I don't know how representative my play style is compared to others', but I don't use Treasure in Story Mode - I restrict it entirely to my Quest Mode characters. But now Quest Mode is going away! So I need to understand what the value of all the Treasure cards that I've collected is, 'cos it seems like it has none at all. All that money spent on Treasure Chests... wasted! To say that I feel that OBS have done something reprehensible here is to put it mildly!
I believe that the only fair fix for this is to allow a mechanism to allow Treasure on a per party basis. There has to be a way to use the collected Treasure but also experience the "pure" Story Mode without completely Nerfing it by allowing Treasure.