With the update coming, no more stark cubes, no more unique items what is really going to be stored now in these stash's . Unless I read wrong the new omega items are not hero specific but equippable by anyone? maybe I misread, but it just seems like these stash's are going to be really under utilized and at one time was a better value to go with then generic stash because of the ability to sort everything by hero.
I know some different builds you will have different items or legendaries, but most play 1 style and won't have half a stash of omega, legendaries, or artifacts for that hero.