Despite only costing you half an action, organizational actions are just as effective as personal ones within their scope. If there's something that falls within the Watch's area of expertise you can definitely bring them in and have their contribution help meet your 'quota' of effort spent. But at the end of the day, if you'll excuse me borrowing a phrase from the other Warhammer: "Success requires no explanation, failure allows none". If you succeed, nobody will care if Mathilde sat around in her pyjamas for six months reading trashy novels while the Watch did all the work. If you fail... well, you've got fairly substantial wells of goodwill to draw from, but if you develop a habit of failing then eyes will be drawn to how you're spending your time, and in those times you'll definitely want to have a well-punched timecard.