You do not need last-click to come back. You need a measurement stack your board will actually believe.
Since iOS 14.5, the dashboard most teams still trust has been quietly lying to them. Platform-reported conversions overstate. Last-click undercounts everything that touched the buyer before the final tap. And the board keeps asking a simple question the dashboard can no longer answer: what did paid actually contribute?
The fix is not a new attribution tool that promises to stitch it all back together. It is a small set of measures that each tell the truth about a different thing, read together.
Three numbers, three jobs
- MER, the marketing efficiency ratio. Total revenue divided by total marketing spend. It does not care which channel gets credit, which is exactly why it is honest. It tells you whether the whole machine is working.
- Incrementality. The only way to know if a channel is creating demand or just taking credit for it. Geo holdouts and scaled-back tests answer the question a dashboard cannot: what would have happened if you had not spent?
- Pipeline by cohort. For anything with a sales cycle, tie spend from a given month to the pipeline and revenue it eventually produced. Not leads. Pipeline.
No single one is the answer. MER without incrementality flatters your branded search. Incrementality without MER is a science project. Together, they hold up.
What board-ready actually means
A board does not want a screenshot of platform ROAS. They want three things: is the money working, is it working better or worse than last quarter, and how long until it pays back.
So the report is short. MER and its trend. Pipeline contribution by cohort. CAC and payback period. One line on what changed and why. No vanity metrics, no defensive footnotes.
Teams that rebuild this stop having the Monday argument about whose numbers are right. Everyone is looking at the same three numbers, and the numbers survive scrutiny.
Where to start
Fix the inputs first. Confirm every conversion event fires cleanly and once. A measurement rebuild on top of a broken pixel just gives you confident wrong answers. Then set MER as the top-line number, run your first incrementality test on the channel you are least sure about, and wire spend to pipeline by cohort.
Last click is not coming back. You do not need it to. You need numbers you can defend in the room where the budget gets decided.