Seriously, it's so easy to remove the lore influence from Highlanders not having their brows, they haven't lived in Ul'dah for 15 years and plenty of them are integrated into Eorzean society, 15 years is a lot time to grow some nice brows.
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Spoiler and joke
Could you imagine Ilberd going "You.. You've grown eyebrows! You've truly betrayed Ala Mhigo, you castrated bull!" to Raubahn?