Reforge had an abyssal art direction I would not trust it for a moment. Also there are screens from WC3:R where they have more narrow eyes
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Concept art is always the base, and as you have pointed out, various custom models and the old model nelf have/had them.
Personally, I feel like, if they have the tech to do it... they should give a variant of narrow eyes to Night Elfs as well, Night Born still look different enough. I don't think that
Night Elfs have the same vibe with narrow eyes like Night Born anyways.