On the other hand ClusterControl has an extensive set of management features that starts with automated failover but goes through node management, scaling (adding nodes to the cluster), backups, automation of creating DR sites and clones of production clusters. ClusterControl also helps during the upgrade process and it comes with a user interface for load balancers like ProxySQL. The best way to get yourself familiar with all the features that ClusterControl provides would be to register for a free trial and experience all of them for yourself.
A key aspect of database administration and capacity planning for your application is monitoring your cluster's health and performance. Although MongoDB Atlas, which is a Database-as-a-Service cross-cloud platform, handles a vast majority of administration efforts and has built-in fault tolerance/scaling ability, it is crucial that users know how to best monitor their clusters and tweak or scale whatever they need before hitting a crisis.