To me, this year was all about carbon neutrality for Apple while still trying to point to progress & make more profit. It was emphasized with the AW9, but no more leather cases for the phones was a huge step towards this effort. I would expect more of the same next year until Apple can sustain carbon neutral status with the phones.
Of course Apple wants to use more plastic for profit lol just like how they don’t come with recharger and call it saving environment.