From my experience, here are the most common use cases of vRealize Automation solution:
Create a catalog of standard operating systems that can be consumed by an organization with a single click
Offer other services beyond infrastructure, for example—PaaS, XaaS
Requirement to integrate with CMDB or ITSM tools to track activities about a machine when it's provisioned
The integration of an IPAM system for an IP address when provisioning a machine
Advanced governance is priority
Hybrid cloud deployments
Many other use cases can be listed here, but I will limit the list since our primary requirement is to make you understand the core capabilities of the product.
Do spend some time to recognize the goodness this product has: