Most marketing advice is optimized for the marketer's comfort, not the client's growth.
Everyone has a playbook. Few have the spine to throw it out when the numbers say so. The hardest conversation an agency can have with a client is "we were wrong about this" — and almost none of them have it.
We'd rather tell you your Q3 campaign isn't working in week two than wait until retainer renewal to have the conversation. That's not a feature. That's the whole product.