How would that work if you have halfway progressed through it and reset it without removing the items dont you think that it will make things worse trying to restart it?
like i said it would only remove items from quest, loot can be kept and not altered when quest is reset and dungeons would remain as you left them
For example bethesda would classified lootable items as "Class="quest"" and in the script would make it, so quest lootable items be removed and reset.
Seen how certain lootable items only appear after you initiated the quest, they would be reinstated after you start the quest again.
I am not asking for them to reset quest but cancel them and then you would be able to go where you got the quest and begin it again.