As far as I can tell, none of the current Kindle models have physical page turn buttons anymore, which is insane to me.
Turning the page is the main thing I do on an ebook, having a button on the side is so much more convenient than touching the screen, I don't obscure what I'm looking at, and I don't smudge the screen.
The BOOX Palma is an e-ink Android device (not a phone) that I run the Kindle app on. It has physical page buttons, and is better than any of the Kindle devices I've used. Also tunable ink speed and color temperature.
Turning the page is the main thing I do on an ebook, having a button on the side is so much more convenient than touching the screen, I don't obscure what I'm looking at, and I don't smudge the screen.