Use of primary callout?

When would you use the class primary for a callout component?

About Callouts - "Callouts appear when a user interacts with an element of the page, for example highlighting an error that occurred after the user clicked Save." So its natural to use danger, success, warning to highlight a success/ or an error.

To show the user information in our applications before the user interacts we use a hint component for example with the primary class.

Is there any use cases for a primary callout in our case?

Cheers!