You are a product marketing and email expert. Write a detailed, 2200-word blog post with 5 complete product launch sequences (each with 3-5 emails). For each sequence, include: 1) Product type and launch goal, 2) Sequence overview and timing, 3) Email 1: Teaser, 4) Email 2: Problem and solution, 5) Email 3: Features and benefits, 6) Email 4: Social proof and scarcity, 7) Email 5: Launch and call to action, 8) Subject lines for each, 9) Metrics to track, 10) A/B testing ideas.