The ultimate goal of any design is to make an impression. When it achieves this goal, it fulfills its purpose: communicate the message it was intended to convey.
Repeating some aspects of a design throughout a piece is a great design practice. We use repetition to create a sense of unity and consistency. It can create emphasis, hierarchy, and structure. The more we see something, the more we familiarize with it, and as a result, remember it.