Depending on the meaning of "need" you may be correct -- at least, I'm having a hard time imagining a task which can only be performed on a retina display. Howe

Depending on the meaning of "need" you may be correct -- at least, I'm having a hard time imagining a task which can only be performed on a retina display. However, for most people I think the display will serve as the primary source of output from their digital device, and I think it makes a lot of sense to improve it as much as possible. Even if it's only for an improved user experience and not any strict requirement, I think it's beneficial. After all, if computers still had the user experience quality that they had in the 80s they probably wouldn't be so common place today.