In my personal experience, it is true that when people always use a defensive communication in their relationship with others, not only the problems won’t be solved, but also worsen their relationship.
When I had a conflict with someone, if my friends use some types of defensive communication towards me, such as evaluation (they judge me in anyway), it will make me upset and feel uncomfortable. Instead, if they use a supportive communication such as describe, I will be more willing to discuss the problems with them and also try to figure it out together.