WHY are Arai's Brow Vents in the faceshield?

Faceshield Brow Vents

We don't think there should be forehead vent holes punched in the shell so close to the biggest hole - the facial opening. The holes also reduce both the shell material and EPS liner in that area, which simply isn't necessary. (And while some others have copied our vents, they've failed to use the ducts to direct air to areas other than your eyes.)