The allocation of an asset and its related assets to Perspectives and Groups can change depending on how each of them is tagged.
Here's an example. Consider that you have an EC2 Instance (let's call it Instance1) that is tagged as Env = Prod. You also have an EBS Volume (let's call it Volume1) tagged as Env = Dev that is attached to Instance1.
The platform groups these assets in one of two ways, depending on the Asset Type you select when building a Perspective.
Asset Type is Asset: Instance1 is allocated to the Prod group and Volume1 is also allocated to the Prod group, because it is related to Instance1. Asset Type is Any Taggable Asset: Instance1 is allocated to the Prod group and Volume1 is allocated to the Dev group, even though it is related to Instance1.
For AWS users, Perspectives allow you to take full advantage of AWS tags but allows you much greater flexibility by leveraging a resource-based approach to grouping your assets.