In this case,I felt it was only needed because of having jury trials. I had the same takeaway that is useful in other places as you. For example, my boss presented a feature that I had worked on better than how I would have done it.
However, I really think it's a stretch to assume that judge's are immune to presentation style.
Bonus common law track: https://www.youtube.com/watch?v=SBM82Ju2kJU
[1] compare "what have the Romans ever done for us?"