I dont think save scumming will a problem in Original Sin. It was a huge problem for me in Divinity 2 though. The loot in this game was so random and there were a lot of items you could only obtain through random loot, e.g. potion or crafting recipes, high level charms, malachite. OS does not have that many items of that type, so I think it wont be that big of an issue.