Purpose statements are easy to write and easy to ignore. The test is not whether it sounds good on a wall. It is whether it has ever caused you to turn work down.

Positioning is an argument aimed outward: why a buyer should choose you over the alternative, defended with proof. Purpose is aimed inward: why the business does what it does, and what it will not do for money. They are frequently confused, and a purpose statement pressed into service as positioning produces marketing that says nothing.
The distinction matters commercially. Positioning has to be different from competitors to be worth anything. Purpose does not — several companies can honestly hold the same purpose. What purpose has to be is true, and specific enough to constrain a decision.
A purpose that has never caused an uncomfortable choice is decoration. The useful ones show up as refusals — an enquiry declined because it was outside what the business is for, a shortcut not taken, a customer let go, a product not launched.
So the question to ask in the workshop is not "what do we believe". Everyone believes in quality and integrity. The question is: name a piece of work we turned down, and tell me why. If nobody can, you do not yet have a purpose; you have a wall.
This is also the reason purpose cannot be written by an agency alone. It can be articulated, sharpened and made sayable by one, but the raw material has to be a decision that was actually made.
Hiring, first. People join technical businesses for the work and stay for what the place is like, and purpose is the shorthand for the latter. It is the difference between a careers page nobody reads and one that filters candidates before they apply.
Pricing, second. A business that knows what it is for holds its price more easily, because it is clearer about what it is declining to be.
And in what the sales team says no to. If purpose has not reached the pipeline it has not reached anything.
If the business has an unclear position, no consistent story and a website a buyer cannot specify from, purpose is not the problem to solve first. Fix what the company is for a buyer before working out what it is for itself. Purpose done early, on unstable positioning, tends to produce a statement that has to be rewritten within a year.
Purpose is also the wrong tool for a business in survival mode. It is a compounding asset, not a lever, and it pays back over years.
Key takeaways
It matters, but for different reasons. In consumer markets purpose can drive preference at the point of sale. In B2B it mostly drives who joins you, who stays, and what you decline — which shows up in the work rather than in the pitch.
One sentence someone can repeat from memory after hearing it once. If it needs a paragraph of explanation it will not survive contact with the sales team.
The people who make the difficult calls, which usually means the founder or MD and whoever runs delivery. A purpose defined without the people who have to honour it is a communications exercise.