
Decent example of digging deeper, than just slapping "display function" on a bodypart could be the ceratopsian's frills. I've seen articles, even some paleodocs/individuals ignoring, how the frill could block stikes, or even claiming how it couldn't protect much due to predator's bone crush bite.
Source to learn more: https://youtu.be/c5T5GMxYnZM?t=411