They exist! Meant for backpacking/back country work.
I spent a summer as a wilderness search and rescue intern/volunteer/grunt/mule during college and was shocked at how much weight could have been saved with better gear. There’s just a minimal market for it.
I don’t believe it. Titanium is, mechanically, a great material for a lightweight pot, but in my limited testing, I don’t think it’s inert enough. Green tea in a titanium pot is especially nasty.
https://www.gutenberg.org/ebooks/18137
the audiobook read by Tabithat is just about professional quality and is highly recommended:
Garage Grown Gear has some of the trendy light and ultralight stuff.