One of the biggest constraints in a business is employee focus. Theoretically, you want to maximize future free cash flow. Unfortunately, there are many inputs: rev growth, solid roi on capex, lowering non-essential costs, employee retention, unit costs, brand etc.
Management teams have to distill the message about what they want in a way that many employees can get behind. Nestle was too focused on unit costs, and should have likely added one more constraint like rev growth, but if they added too many, employees as a group would lose focus.
Most businesses have 2-3 essential business drivers. 1 is never enough, 4+ is likely too many to focus on.