system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Trek] Why do Romulans only have one hair style?
gpt
Imagine you're from a culture that highly prized styling their arm hair. They dye it difficult colors, shave patterns into it, wear it at different lengths, etc. A wide variety of these styles are culturally significant, and some are just for fashion/vanity. Then you meet humans. You ask: "Why do all humans wear the same arm hair style?"

Romulans just don't have any cultural significance to hairstyles the way other some cultures do. They cut it the way you'd brush your teeth - a routine grooming thing, not an identity thing.