ROAS sounds precise, but it stops being useful the minute the source-to-revenue handoff breaks. If booked jobs and revenue never flow back into the measurement layer, the platform is optimizing to a partial truth.
A platform can only optimize toward what it receives. If it gets form fills but never receives booked jobs or completed revenue, it will learn toward cheap activity instead of valuable activity.
The real problem is usually not the formula. It is the handoff. Source identifiers break, routing overwrites the original attribution, or booked revenue never gets stitched back to the original campaign record.
A clean handoff means the original source record survives all the way through the funnel: click or call, lead, booking, completed job, and revenue.
The same principles behind practical attribution apply here: preserve the original source, keep fulfillment routing separate from demand generation, and feed the downstream truth back into the buying system.
Once the source-to-revenue link is stable, ROAS becomes much more useful for real decisions. The team can compare channels by booked revenue, not just lead volume.
It also pairs much better with cost per booked customer instead of relying on top-of-funnel economics alone.