I'm not going to address how much fuel it takes to cook or how heavy it is to carry around. I'd rather address the ability to cook what I wish at the end of a long day. I like cooking on cast iron at home for all the reasons stated before. I also like cooking on my old copper clad Revere Ware. It reduces the chances of burning food like the cast iron will and is lighter. I prefer using it on camping trips for its durability and while it is less non-stick than my cast iron the food that does get stuck is easy to release.
Because it diffuses the heat I don't have to micro manage it like TI when I'm tired and the assortment of different sizes means that I can bring the smallest size I need if it is just me or a group of twelve.
If i don't want it eating up room in my panniers I hang it off the back of my rear left bag and let it catch drivers attention, something that never hurts.
Just my thoughts on this.