A strategist writes it, a designer interprets it, a developer rebuilds it, and a media buyer optimises for something else entirely. Four competent teams, one incoherent brand.
There is a kind of waste that never appears on an invoice.
A brand commissions a positioning study. It is good work. A clear proposition, a defined audience, a tone of voice, delivered as a PDF. Three months later a design studio is briefed from that PDF, or more often from a summary written by someone who read it once. The designer makes reasonable choices that were never in the document. A developer rebuilds those choices in code, making further reasonable choices about spacing, motion and responsive behaviour. Finally a media agency writes the ad copy, optimising for a click-through rate that has nothing to do with the original proposition.
Nobody did bad work. The brand still ended up somewhere it never chose to go.
The cost sits in translation, not production
Every hand-off is a translation, and every translation loses something. The loss compounds. By the fourth hand-off you can trace the output back to the brief only in outline. This is why so many brands feel approximately right and specifically wrong. The logo is fine, the site is fine, the ads are fine, and none of them are saying the same thing.
Process helps. Brand guidelines exist precisely to reduce translation loss. But guidelines describe outcomes, not judgement. They can tell a developer which grey to use. They cannot say which of two equally compliant layouts better serves the proposition. That judgement sits with the person who wrote the proposition, and by then that person has left the project.
What changes when the team does not
The answer is not to hire one agency for everything. That is a procurement solution to a craft problem. The answer is continuity of judgement. The same people carry the argument from positioning through to the shipped thing.
In practice the person who wrote the brand story also writes the product page. The designer who built the packaging system also sets the ad templates. The engineer who built the site sat in the room where the proposition was argued. None of them are translating, because none of them received the brief second hand.
It is a smaller team than the multi-supplier model and slower to start, because the group has to actually agree before anything ships. That upfront cost is the point. You pay it once, in a room, rather than four times, in production.
Three questions worth asking
Can the person who designed your last campaign state your positioning without reading it?
When your developer made a judgement call, who did they ask?
If you removed the logo, would your packaging, your site and your ads still look related?
No, nobody, and no. That is where the money is going.

