I carry FiberFix because it's only half an ounce and requires no tools. My touring bike has had a couple of sets of solid 36-spoke wheels and has never broken a spoke (14,000+ touring miles). My total weight: me, equipment, & supplies is always less than 215 lbs. The half-ounce insurance is all I need.

BTW: When I toured back in the 1970's I broke lots of spokes on my steel-wheeled 10-speed. Even then I was able to hobble into a bike shop with several spokes broken. Modern wheels are a lot more solid.