A limit to qualitative models is that they cannot show multiplicative effects. A famous example is the formula for successful people (see also M. Gladwell's "Outliers"). According to this our success is the multiplication of hard work, talent and luck. No luck, no success. Little talent, little success despite all effort and even luck.
So, everything seems equally important for success, but the insight bars suggest that one alone would already lead to success.
But if we look at the matrices of the effects of each single ingredient we see that they equally depend on each other.