In my opinion, user onboarding tools are most valuable for accelerating product adoption, because their main purpose is to help new users quickly understand a product’s core features and start using it effectively. Through guided tours, interactive walkthroughs, tooltips, and personalized onboarding flows, users can overcome the initial learning curve and reach value faster. While improving engagement, reducing churn, and enhancing customer satisfaction are important outcomes, they largely depend on how quickly and successfully users adopt the product in the first place. Therefore, faster product adoption is the key impact, as it sets the foundation for long-term usage, retention, and overall customer success.