Act as a senior UX designer with 10+ years of experience in product management. Analyze the impact of progressive disclosure in [specific product type, e.g., mobile apps, SaaS platforms] by evaluating how it enhances [user engagement, task completion rates, or onboarding efficiency]. Provide a detailed case study on [a well-known product, e.g., Slack, Airbnb] that successfully implements this technique. Include metrics such as [time-on-task reduction, error rates, or user satisfaction scores] to quantify the benefits. Also, discuss potential pitfalls, such as [information overload, hidden features, or user frustration], and suggest best practices for balancing disclosure with usability. Your response should be data-driven and cite at least [3] academic or industry sources.