Google Analytics 4 (GA4) has been designed as an entirely new version with a different set of advanced features aimed at providing an improved user experience, compared to Universal Analytics (UA). It is oriented towards offering more insightful data analytics based on user-centric measurement, superior privacy protection, advanced AI, and complete cross-platform tracking. As part of this upgrade, Google might have decided to revamp or eliminate certain previous features based on user-data analysis, feedback, and the latest market trends. Therefore, it is not uncommon for a few features that existed in UA to not be available in GA4. It’s better to consider GA4 as a separate entity from UA rather than a simple upgrade. Google is also constantly updating GA4, so some missing features might be added in the future.