It's also confusing to see the books say something along the lines of "Warfare skills are skills for warriors. High strength improves these skills." while the blue text shows that it will scale with Intelligence if the selected character has an Intelligence-based weapon equipped.
Example: Battering Ram

Which leads to my next point - it's not possible to tell from a skill description whether the attribute it scales from is fixed or weapon dependent (without switching weapons around which is tedious).