I've recently finished D:OS again, this time EE edition, and I gotta say inventory micromanagement eats huge chunks of time. It definetly is in need of a huge revamp.
I can understand the need of separate inventories while playing coop, but for single player I'd much rather prefer shared inventory for all party members.
My main problem is that unlike Loremaster skill, highest number of which can be used by all chars to identify items, other skills like Barter, Crafting and Blacksmithing, for example, are not shared across party members and so you constantly need to send all those items you wanna trade, craft or smith to those party members who have these skills at highest numbers. And since you can only send one item at a time to other party member this takes huge amount of time overall to micromanage this stuff. Which is really unnecessary and constantly detracted me from having fun of actually playing the game. And by playing I mean progressing through the game not sitting in the inventory screen for hours.
So for D:OS 2 I would strongly suggest making shared inventory, at least for single player. And also, I would very much like some skills to be shared as well, such as the aformentioned Loremaster, Barter, Crafting, Blacksmithing and maybe Charisma.