Most business growth consultants and advertising agencies use a linear Task oriented system that resembles an assembly line (with already established start and end points).
When it fails, they don’t waste time studying why it fails, many times they don’t even have accurate or useful tracking systems to analyse why it failed.
They start with a clean slate again and again and over again without spending time and energy studying the mistakes.
To them, it's an art, or worse, a gamble. They become artists with a goal to seek applause and engagement and while generating revenue and consistently producing profitable ROAS end up taking the back seat.
They are more focused on pleasing or impressing the customer than to be figuring out predictable ways to generate consistently profitable revenues.