I think the lore answer is that they actually dont have eyebrows because the hot sunny climate or something.
Which doesnt make sense because that climate actually produces heavier eyebrows and hair as skin and eye protection from the sun. The wiry and often curly kind genetically, as curly hair can cover more surface area without retaining more body heat, and carry more oils which protect your skin from drying out.

Yes, cold climates produce more body hair too genetically obviously for warmth reasons. The curly hair type tends to be a wavy type that can poof up and retain heat better.

Midlanders are the ones who have a subtropical implication and that is the climate where humans develop the least body hair genetically.

But not having eyebrows doesnt exactly make for a fantasy feel like elf pointy ears and tall frame.
Youre just... a guy with no eyebrows.