The lesson of communication is timeless, and appropriate for all ages! Minase was one told by an editor that, for a lot of her younger readers, this will be their first time getting into, learning/experiencing the topic of love and relationships. So it's important for her to try to cover as many topics as she can, as skillfully as possible.
Haruna's friends telling him "if you want people to know what you think you need to tell them" is such an important message that is worth hearing over and over again. It also helps give depth to Haruna showing he has layers beyond cheeky playfulness, and flirty. That he too can feel just as nervous, or insecure, as Nao can at times.
