Need for GA4
Google Analytics GA4 seems necessary for a better audience understanding, event-based analysis and monitoring, visualization, and feature-enable data collection and integration with other apps. In addition, it allows segmented and more targeted audiences based on events, not on sessions like Universal Analytics.
Generally, the latest version of Google Analytics tracks complete user-path across many platforms. It provides detailed insights into user behavior and how users interact with your website or app. Additionally, it possesses a more spotlighted dashboard as compared to earlier versions. It also provides more features to explore and control analytics.
Likewise, its cross-platform tracking makes it unique and more compelling than other versions of Google Analytics.