That is all well and good for simple fetch quests, but what if the quest is more complicated and requires specific triggers and followers to function?, it would break immersion more to have disjointed dialogue and no chronology for quests than locked doors.
I'm really not trying to be rude here...but...
Please give an example of one of these complicated quests. I've played well over 1800 hrs in Oblivion and I think almost every quest in one way or another was a simple fetch quest.
Knights of the Nine was almost entirely a fetch quest...Every deadra quest was a fetch quest....Shivering Isles was a messed up fetch quest... I mean think of playing fetch with a dog... you send the dog after some thing and they bring it back... not sure of all the guilds but I know for a fact even when you get kicked out of the Mages guild you had to FETCH a bunch of ingredients to get back in....so please give me an example.
Oh and breaking immersion??? what immersions me into this game IS the fact that I'm told I can go any where and do anything...