A few thoughts: * Google has a large and very competent design team. They are not changing things "for the sake of changing them." More often than not, changes are made in response to issues discovered during usability studies. * You are not the user. I am not the user. The designer is not the user. In fact, for a project as large as Android or Gmail, there is no "the user". You're always making trade-offs between po…
However, this is still just a hypothesis. It might turn out to harm usability on some platforms while helping on others...or harm usability across the board. Adherence to a standard is not necessarily the same thing as a usability improvement.