The battery is optional (slides can be backlit by holding the foldscope up to a room light or even the sun). Throwing it away is optional (these foldscopes are

The battery is optional (slides can be backlit by holding the foldscope up to a room light or even the sun). Throwing it away is optional (these foldscopes are quite durable). I think your criticism can be applied to any consumer good, since all consumer goods eventually end up being thrown away.