Gotta love "Incentives and Laws of Unintended Consequences"...;-)
I think it is good to look at the "Organization" as just another business trying to manage their "employee's". "Worldly" businesses have the same challenge similar to the options below:
1. if you are an hourly employee, typically the business expects you to work a certain amount of hours. The unintended consequence is that the employees find creative ways to work slower or "cheat" on their hours. The typical solution to this is to add production quotas (e.g. number of magazines) and/or add more and more managers to "crack the whip".
2. If you are a salaried employee, typically the business expects you to hit your quota regardless of how much time you spend doing so. The unintended consequence is that people spend less time doing the work and find more "creative" ways meet the quota. And again, the business puts in more and more managers to "crack the whip".
3. If you are an unpaid volunteer, typically the business sets a set of goals/vision usually with an intrinsic value. There may be hours or production quotas, but the focus is to appeal to the person's commitment to the goal and vision. The unintended consequence is that people will stop volunteering when the goal (or vision) is no longer compelling.
The "Organization" seems to be a mix of the above even though they state that JWs are "unpaid volunteers" (#3 above). However, they try to measures hours and quotas and don't have a compelling goal or vision. No wonder you can't really trust their numbers.