New "Display Rule" Option?

There are currently 5 options in Display Rules:
1. Show/Hide
2. Hide/Show
3. Show
4. Hide
5. Rename Label

I would like to suggest a 6th:
If a certain condition is met, perhaps you can flash a message / popup to tell the user something. Kind of “hover” / “further info” / “warning” if needed.

I do not think in my (admittedly) weird use case. But let me look again. I did try those options at one point. Thanks!

Would a validation rule (which shows a message for a condition to be met on a field), or a page rule (that shows a message with the status of a particular field) work here for your needs?