I don’t see much of a problem ngl.
When I see the term “More expressive” my mind kind of automatically goes to “Can make more distinctive expressions.”
DK’s original brow specifically wasn’t very expressive, and the perpetually angry/grumpy look it made it kinda hard to tell when he was happy or calm. Any “Happy” face he made just looked kinda weird.
In a game where he’s actively being helpful and friendly to someone, it only makes sense to give his brow that makeover so his intent is easier to understand.