I too go back and fourth about what counts as far as pack weight goes. I always bring some kind of knife and sheath when I go out, even on day trips, so I had thought about taking that weight off of my base weight. But then I would have to do a whole worn/carried weight, and then it's a whole slippery slope to FSO weight, both of which I am not interested in getting into. I spend enough time and energy weighing and packing and re-packing my backpack and its contents. So I just include in my base weight anything I have on my belt and pockets, plus any clothing (such as a jacket) that I don't plan on wearing while I am hiking, but wear at camp in the evening/at night. If it is cooler outside, especially in the spring/fall, then I will not include say, a jacket because I have it on nearly all the time.
I also prefer metric light weight figures, which give a little more wiggle room with weight (LW = less than 10kg, UL = less than 5kg, SUL = less than 2.5kg, XUL = FSO less than 2.5kg). But most people on here use the American weight scale, so when adding my gear lists I just stick to that rather than try and convert everyone to the metric LWB scale.
It's all arbitrary, but arbitrary can be fun and useful at times.