I have the habit of not looting chests or other containers in friendly areas (Lothering, Redcliffe, etc.). If there is a chest in, say, a house in Redcliffe and I loot it, then I'm a thief, whether somebody sees me or not. Since I'm playing "good" characters, I shouldn't do that, so I avoid it to improve game immersion. The obvious consequence of doing that is that I miss some money and gear, but that's fine with me, it's a part of the challenge. But I wonder if that might be counterproductive in the sense that by avoiding those containers I might be missing important quest items. For instance, I checked the chest in the mill in Redcliffe and found a love letter there that looks like it might be important for some side quest. Is that common in this game? Is there important content that I will miss if I don't loot containers in friendly areas? Also, is there anyone who also does this?
For the record, I'm using an auto loot mod, so checking each container to see if it contains some important item is not really an option, as soon as I click the chest I loot it and it can't be undone.