Only thing I’d change is moving the volume buttons to the right side with the power button. The number of times I’ve taken a screenshot trying to un/lock with my left index finger is astronomically high.
Or putting the power button back on the top. Or going back to the iPhone 5's round volume buttons.
Both the placement and shape of the buttons leads to accidental presses and the inability to easily identify them by feel. Almost anything would be an improvement.
And USB-C.