I feel there had only been slight variantions of three distinct designs: glass front with flat aluminum back (1 gen, 5, 5s, 6, 6s, 7); glass front with curved plastic back (3g, 3gs); and the glass sandwich (4,4s,8, x to an extent). You can remove home butttons and shift things around but generally the design has been consistent for 10 years. It’s not a bad thing and there are limitations imposed but utility. I just think it’s funny how we and Apple try to sell little changes as groundbreaking.