I'm not a bikepacker, but I am a UL hiker and bike tourist. My UL hiking pack weight is under 8 pounds in three-season conditions, but a bike tour essentially doubles that. That's because of the tools and spares, the heavier more durable packs, and a bit more clothing to deal with long high speed mountain descents.
It took a lot of experience over many seasons to safely get my pack weight to the 15 pound level for bike touring. That included getting comfortable with a single-wall shelter and a down quilt. Those have learning curves. Reducing clothing to the minimum was also difficult. A large part of it is learning how to manage your consumables. Not carrying too much food, water, and fuel, and knowing where it's safe to cut out the extras, is tough. Going stoveless works for me, not for others.