Favourite App and How Would You Improve It

Question: What is your favourite app/product, and how would you improve it? Key points: This is a classic PM product-sense prompt. A strong answer picks a specific product, articulates why it's genuinely liked (clear user value, elegant UX, or business model), identifies a real gap or friction point through structured reasoning (user segments, journey mapping, or metrics), and proposes a concrete, prioritized improvement with a rationale for expected impact - rather than a vague wish-list.