Diversity for the sake of diversity is useless, whether we are talking phones or people... Your company should hire the best and most qualified people for the job... It shouldn't matter what color they are, what religion, whether they are male or female... If the best people are all white males, so what? If they are all South Pacific lesbians, so be it. LOL
Anyway, applied to phones... Just being different isn't enough. Apple has insisted on staying with "their way", and the result is that they went from the top dog in the smartphone world, to Android taking over 84% of the world market. Apple went from being the wealthiest company, to losing that title. Their stock plummeted while Google's doubled.
While Apple is different, obviously that's not always a good thing...
People love Apple hardware, myself included. But iOS is too limiting for a lot of people, as evidenced by Android's complete takeover of the world.
iOS could still be iOS, but lift some of the silly limitations... Let people set their own app preferences... build some widgets, make these improvements but do it with an "Apple flair"... Give users a file manager, or let them use their iPhone as a standard USB drive without clunky half baked apps that never work right...
They can still be their own entity, but without the limitations... But when they continue to put form over function, they can't do that...