I’ve not weighed the kit I’ve taken but to some extent it depends on the weather at the time. Also depends on whether you want to be properly cosy or are doing some kind of race where you might put up with a bit of discomfort.
Constant process of learning IMO: go through the kit you took – did you use all of it? Was there something you should have taken? Did everything perform in the way expected? That sort of thing.
I’ve got a sleeping bag, mat and tarp setup that weighs about 1100g – fine for summer but if it was frosty then I’d be using my winter bag, a bivvy bag and possibly a heavier duty sleeping mat so the weight would be closer to 4Kg.
You can apply the above to other areas of kit, there’s no one right solution, even on the same night, stopping in the same place two people would have a different level of requirements and kit. What’s right for you might be wrong for me.