Teach your teenager to think in seven dimensions.
The essay prompt is "Should voting be mandatory?" Your teenager has an opinion. One opinion. From one angle.
Open Yesbrainer together. Type the question. Watch the Synthesis Engine reveal that mandatory voting has economic costs (enforcement infrastructure), political consequences (parties compete for the centre, not the base), social effects (reduces the class gap in political participation), cultural implications (redefines civic identity), and ethical tensions (autonomy vs. collective duty).
Your teenager just learned something no textbook teaches: every interesting question has at least seven answers, and the best thinkers hold all of them at once.