The Chewbacca tarzan yell is ridiculous.
Maybe Lucas included it to remind the audience they are watching a movie and they shouldn't suspend their disbelief.
(Muffled Sniffling and sobbing)
Lucas Daughter 1: What's that sound?
Lucas Daughter 2: Daddy is looking at ChefElf again.
But LOTR Two Towers was worse when Legolas went surfing/rollerboarding down the steps of Helm Deep. I wish this unfolded:
Howard Shore: I'll score that bit with a Beach Boys Parody.
Peter Jackson: Oh don't do that. People will think we're lame.
Howard Shore: Like Chewbaca's Tarzan yell?
Peter Jackson: I see your point. It's gone.