Deciding what to carry is a real balancing of things like weight, performance/comfort, durability, volume and price.
Durability increases weight but may reduce price. Reducing weight for the same performance will likely increase the price and reduce durability. More comfort leads to more weight and more volume, More tools and spare parts increases survivability at the cost of weight and volume. Then hobbies/passtimes. I like to carry a notebook and pens to write, others like to carry camera gear or a drone.

I find it interesting that many put so much emphasis on reducing weight. Yes, less weight permits less effort and longer distances, but why do these two matter so much ? I ride to go places, but I'm not in any hurry to get anywhere, and don't see the need to compare my performance to that of others. I also ride to keep in shape, so the more weight I drag around, the better shape I'm in. The one thing that I can see worth worrying about is the grade of a hill that can be pedaled. But there will always be hills that have to be walked if they get steep enough, just as there's a limit to how much wind you can pedal into regardless of how much weight your carrying. I have no problems with riders who put a lot of importance on performance, but I don't see bike touring as being a performance oriented activity.

That said... six pounds for a sleeping bag is an awful lot, and it must be pretty huge as well.