Journal
Payback windows after the privacy shift
When user-level journeys thinned out, many UA teams shortened the story they told. D7 ROAS is a convenient object: it arrives before the next media insertion order. It is also a poor proxy for whether Advertising ROI for Mobile Apps recovered cash.
A payback window is a funding decision. If your company can only float sixty days of media, a 120-day “eventual LTV” is a novel, not a plan. Mesh Flowgrid cohorts in GB spend a full session mapping bank-line reality to the windows in the MMP.
Start with three clocks, not one. Clock A is media billed. Clock B is refunds and failed trials. Clock C is the OS-limited observation you actually have. If Clock B is ignored, ROAS inflates in the exact week finance is asking why cash is tight.
We also ask teams to write the sentence they will not say. Example: “This network returned 2.4x.” If the number is modelled from a conversion value, the honest sentence names the model. That habit is more useful than another dashboard tile.
None of this restores the old last-click comfort. It does stop a privacy change from turning into an excuse to report only the numbers that still look kind.