Optimizing a single funnel step lifts overall conversion ~0.3× of the step's local gain.

Optimizing a single funnel step lifts overall conversion ~0.3× of the step's local gain.
A +10% improvement at a step that 40% of users reach contributes maybe +3% end-to-end, less if downstream steps leak it back. Local wins dilute through the funnel.

— Weight each step's MDE by its traffic share before prioritizing.
— Fix the lowest-completion step with the highest reach first.

Read the number, not the story. [end-to-end attribution]