out in the wasteland it can become a chore having to load your inventory (not even with everything you come across) and then fast travelling somewhere.
in fo3 etc yould go mitigate some of the burden by using weapons to repair eachother, subsequently lessening the load and also increasing value of weaps. etc.
i would have liked a high level perk that allowed you to scrap anywhere into constituant parts.
parts would still weigh something, but nowhere near the amount that the item itself weighed.
or even a high level perk that reduces the weight of all carried junk to 0.1 pounds per item.