Most engagements in this field open with a plan. Someone senior listens for an hour, recognises a pattern they have seen before, and produces a document. The document is usually competent. It is also built on whatever the room happened to say that morning.
The problem with that order is not that the judgment is poor. It is that nobody can tell afterwards whether the plan worked, because there was no baseline to compare it against. When revenue moves six months later, the causes available are the plan, the market, a hire, a competitor leaving, and luck. Any of them can be argued.
What a measurement buys you
A scored baseline fixes the argument before it starts. It records where positioning, offer architecture, sales process and buyer journey stood on a stated date, against evidence rather than recollection. Six months on, the same instrument runs again and the difference is attributable.
It also changes what gets built. A firm that measures first regularly finds the problem is not where the room assumed. The offer is legible and the sales process is sound, and what is actually failing is that nobody can find the business at the point the decision forms. A plan written in the first hour would have rebuilt the sales process, competently, and left the real fault in place.
Why it is sold separately
Signal is priced and delivered on its own, and the baseline it produces belongs to the client whether or not anything follows. That is deliberate. A diagnosis a firm only performs on its way to selling a larger engagement is not a diagnosis, because the answer that stops the sale is unavailable to it.
The honest version of this work has to be able to conclude that the commercial system is holding and the problem lies elsewhere. That conclusion costs a firm the follow-on engagement. A baseline that can produce it is worth more than one that cannot.