There is no need to use the shared inventory , you can e.g. give all the 9mil ammo to the uzi - guy , buckshot to someone w ith the shotgun and so on ... It´s the same with the stuff that can´t be used during combat - parts for mod crafting . Keep it in the shared inventory or let your mecanic carry it . Same with loose medical supplies .
The micromanagement part is reduced if you compare it with JA2 vanilla but for the average X-com player it might be still to much ...