Frontend engineers often face challenges in showing UI elements like tooltips or modals only once per user visit due to localStorage limitations, which is scoped to the browser rather than the user, causing users to see repeated elements across different browsers. LocalStorage also has constraints such as limited data storage capacity, synchronous operations that can slow down applications, and lack of data protection, making it unsuitable for complex or data-intensive applications. A more effective solution is to implement a user-scoped service by building a key-value store API around a database, allowing for better tracking of user interactions. However, creating a custom solution can become complex, especially when managing nuanced user interactions or debugging issues. As a result, many companies eventually turn to feature flag management platforms like LaunchDarkly or Posthog, or adopt ready-made solutions like Frigade, which offer comprehensive tools for tracking user impressions and displaying the appropriate UI elements efficiently.