But that describes exactly the WoD Mu*er's current use of time & temp systems: A default, not a requirement. It provides a framework from which you can easier write that set, a writer's tool. If you decide to ignore it for reasons of etc. etc., then it's a tool that you don't need. Me? I love the tool, and I know quite a few people who use it. (c.f., WoD)
I'm not sure how useful a population calculator would be, or if it would be as useful as, say, a weather system that tries to accurately calculate not only rainfall but accumulation based on regional drainage and ground absorption rates. Or if a builder could just say: It's between 4 and 6 so let's describe the place as 'crowded'. I can see the benefits and drawbacks in both.