Similar to how posts can be featured, I think it would be useful to have the ability to feature a tag.
My use case is: I have a series of posts which I want to highlight on my home page. I have defined styles for featured posts themselves, and in this case I’d like to highlight the overall series, not any specific post in the series.
A similar case would be when publishing a course, consisting of many posts. A course (tag) could be featured and displayed differently in the theme.