How to make useful acquisition decisions when deterministic user-level signals are incomplete.
Know what each number represents
Ad networks, mobile measurement partners, app stores, and your warehouse apply different windows, identity rules, and privacy thresholds. Document those differences before debating whose total is correct.
Separate reporting from inference
Deterministic matches remain useful where consent and platform rules allow, but they should sit beside aggregate campaign reporting, incrementality tests, geo experiments, and marketing mix evidence. Each method answers a narrower question with different uncertainty.
Communicate ranges and decisions
A decision-ready report states assumptions, confidence, and sensitivity. Instead of presenting false precision, show which channels remain attractive under conservative and optimistic cases and what test would reduce the most consequential uncertainty.