Yeah that's a lot to be said about being explicit. For example, what if even on a default contract you want to start tracking payment adherence, or maybe sales

Yeah that's a lot to be said about being explicit. For example, what if even on a default contract you want to start tracking payment adherence, or maybe sales information and attributing them to sales' numbers. Or maybe you start reporting and want reports on contracts vs default contracts. And then things get messy. Because the real world gets messy.