Domain-Driven Design is not a silver bullet; as with everything in software, it depends on the context. As a rule of thumb, use it to simplify your Domain, but never to add more complexity.
If your application is data-centric and your use cases mainly manipulate rows in a database and perform CRUD operations — that is, Create, Read, Update, and Delete — you don't need Domain-Driven Design. Instead, the only thing your company needs is a fancy face in front of your database.
If your application has less than 30 use cases, it might be simpler to use a framework like Symfony or Laravel to handle your business logic.
However, if your application has more than 30 use cases, your system may be moving toward the dreaded Big Ball of Mud. If you know for sure your system will grow in complexity, you should consider using Domain-Driven Design to fight that complexity.
If you know your application is going to grow and is likely to change often, Domain-Driven Design will definitely help in managing the complexity and refactoring your model over time.
If you don't understand the Domain you're working on because it's new and nobody has invested in a solution before, this might mean it's complex enough for you to start applying Domain-Driven Design. In this case, you'll need to work closely with Domain Experts to get the models right.
