Why do they call this boundary constructive?

The term constructive boundary is used to describe a boundary that is intended to help build or maintain a healthy relationship. Constructive boundaries are often established to bring clarity to a relationship and to help both parties understand how to interact with each other in a respectful and appropriate manner. Constructive boundaries can help set expectations for behavior communication and emotional connection. They can also be used to create a safe and secure environment for both parties to express themselves in a healthy and productive way. Constructive boundaries can help foster mutual respect and understanding and ultimately lead to a more fulfilling and lasting relationship.