Some of these changes, such as the straightening of the 'M', could be explained by Apple's designers simplifying the design to accommodate the small size and low resolution of the device compared to print, however other changes are harder to explain.
Certain alterations, such as adjusting the 'M' to a straight line, might be explained by Apple's designers optimizing the design for the device's compact size and lower resolution relative to printed materials. Yet, some modifications remain challenging to justify.