If no integration and Cluster managed network are selected, and the nodes are VMs, Assisted Installer create a Baremetal IPI cluster on Virtual Machines that is an unsupported configuration. There is also the message "Your installed cluster will be fully supported" at the end of the interactive wizard.

4.15

always

    1. Install a cluster using Assisted Installer 
    2. Select "No platform integration" in the first page
    3. Start the ISO from Virtual Machines.    
    4. Select "Cluster-Managed Networking" in the Networking page
    5. Complete the installation.

A Baremetal IPI cluster is installed on Virtual Machines reporting that is fully supported.

At least a warning should be present to report the selected combination is not supported.