It's time we acknowledge that the purpose of most UI "progress" or "change" is sales.
An entity like Apple introduces UI "enhancement" to attract prospective users and persuade existing users that the functionality of the product is new, efficient, or otherwise "good."
UI is generally fashion and trend that seeks the "new" at great cost.
This is why there is a lack of internal consistency or rigor with respect to some UI direction: consistency, functionality, etc. are not the point.
An entity like Apple introduces UI "enhancement" to attract prospective users and persuade existing users that the functionality of the product is new, efficient, or otherwise "good."
UI is generally fashion and trend that seeks the "new" at great cost.
This is why there is a lack of internal consistency or rigor with respect to some UI direction: consistency, functionality, etc. are not the point.