> The question is, should the logic be in the central core of the application, or should it be spread around among the components? There are probably many such

> The question is, should the logic be in the central core of the application, or should it be spread around among the components? There are probably many such questions and at this point we’re trying to solve a problem that may not exist in an application we know nothing about. However, with test coverage (and maybe also type annotations) you can delete or move that code around with greater confidence, which means your decision doesn’t have to be as hard or permanent.