Last week, just for fun, I weighed myself and my loaded bike on a truck weigh scale. The problem is these scales round to the nearest 20 kilograms. That doesn't tell me much.
So far, I haven't weighed my gear before a trip, but I might try it some time in winter as I plan for next year's tours. I like to think I'm traveling fairly light, but weighing will give me a more accurate picture. Once I know my weights, I can decide what I don't need.
There are some things that are necessities, others that are optional and some that can be reworked. But I can't make many changes to my weight until I know what I have to work with.