:)
I guess you should include 'speed' in the summary list (unless it's included in 'efficiency'). It's a rather slow process: gathering the fuel source, lighting it, waiting for the boil, waiting for it to get back to room-temp (or forest-temp)... I guess it serves one best to boil a lot and store it, but that just adds backpack-weight for both the cookware and all the bottles.
You nailed it, efficiency is my term for the time required. Boiling is indeed incredibly slow if you have to build a fire, especially if you are dealing with damp fuel sources or do not have an ignition source. However, you could make yourself a cup of tea with a good backpacking stove in just a few minutes...
Boiling in bulk is certainly the most efficient way with a campfire as the heat source, but it comes with its own problems as you described...hiking with extra unnecessary weight is truly a burden. It is great backup plan, but not my primary choice while backpacking.
Thanks for your thoughts and insights! It is always a pleasure to field comments from you!