There is a specific kind of meeting where everybody argues about a number that is wrong. The channel report says paid search is underperforming. The paid search platform says it is doing fine. Both are read from the same events, counted two different ways, and neither party has checked the plumbing in two years.
Browser-side tracking has been quietly degrading for a while — cookie lifetimes cut, third-party scripts blocked by default, consent banners that a meaningful share of visitors decline. None of it broke loudly. It just began undercounting, unevenly, in a direction that flatters some channels and punishes others.
Server-side collection fixes most of it: the event is recorded where the transaction happens rather than in a browser that may refuse. Consent is still respected — this is not a way around it — but a customer who agreed is actually counted.
The unglamorous part is agreeing what a conversion is before anyone builds anything, and writing it down. Half the disputes we are asked to settle are not measurement problems at all. They are two teams using the same word for two different things.
The service behind it
Google Ecosystem — SEO, SEM, Analytics
Technical SEO, paid search and a measurement layer you can actually trust.