Titanium has other advantages than weight. The metal is inherently fairly non-stick, so a lot easier to clean in the field. It also doesn't burn your lips like aluminium or (to a lesser extent) stainless.
The weight saving alone though makes it worthwhile. I agree that if you are staggering from your car to your favourite woods with a sack of potatoes and a freshly butchered cow under each arm, saving a few hundred grammes might not seem worth it, but going lighter is a philospophy that adds up in small increments. I used to carry a Berghaus Vulcan with side pockets, and fill it, typically carrying 20kg for a couple of days out. Now I have a Sabre 45 with side pockets that I can use for a week trek of 100 miles. Just changing my rucksack has saved me 1.5 kilos. I saved another 800g by switching to a down bag, ditched my lightweight Hilleberg tent for a tarp and trekking poles, another 1.4kg saved. That's 3.7 kg saved on three items! That means I can carry a few pounds of rump steak, all the trimmings and a couple of bottles of red to wash it down if I like... or carry noodles and preserve my knees and energy for enjoying the journey as well as the campsite!
The size of the cooking pot and the materials are different issues. My titanium mug has a capacity of 750ml, so works for ultralight meals if needed, but that doesn't mean I can't eat well if I want to. I just need a bigger pot or billy. Of course, a bigger titanium one is still lighter/non-stick etc...
Just wondering, how many on here use the Crusader cup as their only pot when they are out? Or do most carry extra billies?
Agree with the comments on real food though. I have yet to try a "food pouch", even on long trips. They are not even that light. A British army 24 hr ration pack weighs about 1 kilo!