But that's a thing people have to put on their faces, which, as we have seen, most people really don't like. It also costs extra money, unlike a "3D mode", which would just be enabled in the game menu.
Yes but game developers can't rely on optional add-ons because most people won't have them. So there is little reason for the developers to support them. That's why such optional add-ons were rarely successful in the past.
