The most expensive problem in your experimentation or personalization program doesn't show up in your reports.
It shows up as results that are fine.
Not bad enough to trigger a real conversation. Not good enough to feel like the investment is working the way it should.
Tests get run. Reports get produced. Segments get targeted. Budgets get spent.
From the outside, it looks like a functioning program.
But it isn't compounding. And it never will.
Because the infrastructure was never built.
That's not a tactics problem. That's not an agency problem. That's a program architecture problem.
And the longer it goes undiagnosed, the more it costs.