I make it a point to have a class-wide dialogue with my students to discuss the value of the unit after we complete it. This dialogue can be something as large as a full-blown Socratic seminar, or it can be something as simple as an online survey. Either way, the students can communicate their interpretations of the unit. They can ask questions about how certain lessons may pertain to their future endeavors (or not). We have reflections and conversations about what they feel like they need to learn more about, and I shape my lesson planning around that.