Support for managing a heterogeneous environment is typically for large deployments where upgrade of the Managers or the Sensors happens in phases. Consider a deployment of over a hundred Sensors that are on 9.2.x.x. As part of the upgrade process, you first upgrade the Manager as well as some of the Sensors to 10.1. However, during this upgrade window, you might need to manage the 9.2 Sensors as well as be able to view the alerts raised by them. For any reason, if you do have the latest version of the Sensor software but need to manage such Sensors as well, this is possible with a Manager version that supports a heterogeneous Sensor environment.
Trellix strongly advises that you use the heterogeneous support feature only for the interim until you upgrade all your Managers and Sensors to the latest version. This enables you to make use of the latest features in Trellix IPS.