Not sure I follow your line of thinking.

Are you arguing that Utilitarianism isn't a way to guide decisions? And are you saying it is an invalid moral framework?

FWIW, many ethicists suggest using multiple frameworks and would argue using Utilitarianism for policy.

For example, in the EU utilitarianism is rarely used as the sole moral foundation but serves as the primary tool for practical decision-making and public policy. Most visible in how the EU balances competing interests to achieve the "greatest good".