Makes sense to position the handle away from the direct heat, I don't know that I'd chance putting something other than metal in a position that melting or damage would be the possibility. With that, folks considering this system are most likely not setting a sub 1 L titanium pot on top coals to cook or to warm something up when the stove that comes with the pot will do it in a couple minutes.
Lol, less distraction of keeping track of a pot in the fire and enjoy the fire while the stove does it work.
Depends on the situation. If I'm in a hurry and need to boil water quickly, I'll use my stove. Coffee, tea, instant meals, breakfast/lunch. Boiling times is usually under 2-3 minutes with a stove. It's faster and easier to set up and break down and get on with the day. I sometimes cold soak my food as well.
Dinner at camp is usually a slower time to wind down, and I might choose to use different ingredients or try to save fuel. If I use my fire box, it takes a couple minutes to set up, gather a handful of twigs, light the fire and tend to it because it requires constant attention. Boiling water usually takes about 5-6 minutes. I enjoy it because even a small fire can be a big morale boost. I also boil to sanitize water whenever I can avoid using my steripen or filter so they last longer.
A full camp fire is a lot of work, but definitely makes the most memorable meals. I'm kind of a diva with camp fires, so I'll take the time to cut down a dead tree and split the wood to make a hot fire that burns down to really nice coals and clean flames. Steaks, stews, fire roasted veggies, pasta, hot sake, bread, rice, curry, and whatever else. Way better with an open fire for a constant/dispersed heat source, and 2 pots are usually required for a lot of my meals. An extra pan or plate adds a lot of capability for better meals.
On a hunting trip, I rarely do a campfire for the purpose of cooking until I tag out. Cooking and eating isn't the intended activity, and it spreads a lot of odor. Going out with buddies on a weekend or bushcraft/scouting trip, I'll bring plenty of fresh food to enjoy at camp because that's the intended activity and usually cheaper.
A 110 canister typically lasts me 3-4 days. I don't think jetboils are actually much more efficient consumption-wise, just marginally faster at full blast. I can stretch one of those cans to about a week with the occasional fire, or not use my fuel at all if I feel like it. I'd argue that good firecraft and open flame cooking is better woodsmanship, and relying on modern ultralight gear and packaged food is glamping (no offense, I'm a glamper too).