Tent:
Tarptent Contrail, one person single walled tent 1.5lbs. The hardcore people will take a bivy or just a tarp.
This is an impressive tent and for shorter tours I think it's perfect. I'm not sure I'd favour it over something like the
Hilleberg Akto on a longer tour though, when you can't just nip out to the local camping shop in Mongolia and get a replacement. I also wonder if a single-walled tent (not to mention a bivy or a tarp) is going to be as comfortable in cold or nasty weather? The Hilleberg tent, though, is double the weight of the one you describe.
Sleeping bag.
A summer weigh bag or quilt is the way to go. You can be comfortable to 3 season temps by adding layers of clothing.
If you're carrying extra layers, doesn't that offset any weight saved in the choice of bag?
Cooking.
Some people just don't carry cooking equipment. I like having the option. Trangia, Pepsi can stove of other lightweight stoves combined with a cooking set are the way to go. I use an antigravity solo cookset and a Trangia Stove and the combo weighs 0.75lb
I agree that not cooking is surprisingly feasible, especially if you're in a country with a good choice of supermarkets, farmers markets and delis. And you're not addicted to your own cup of coffee early in the morning... we like the flexibility that a stove and cooking gear gives us.