Unlike its previous generations, the new iPod touch does not have an ambient light sensor . When asked by users, Phil Schiller replied in an email that the reason for this lack is because the terminal is too thin .
This is what Phil replied to Raghid, a customer from Lebanon who had asked the Apple management directly about this issue:
The difference in thickness between the new-generation iPod touch and the previous model is one millimeter, a length that seems to have been critical to the decision of whether or not to place that sensor. This shows us that Apple is quite clear when it comes to reducing the dimensions and weight of its mobile terminals. Would you have preferred to sacrifice that millimeter in exchange for the iPod touch being able to regulate its brightness automatically according to the ambient light?