There are other things I'm sure, but a big one is: high heels. And I realized why some years ago.
I do still have some, and I do wear them in the right circumstances, but I find them highly impractical generally. But this is the reason I rarely reach for anything higher than 2.5" anymore: I have small feet--size 6, or 5.5 in sandals--and I realized that heels are made at the SAME HEIGHT across all sizes in a style. This means that the size 8s, 9s, 10s, whatever--have a less steep shoe than I do, plus a more stable sole. Our severe angle plus all-around less actually on the ground means we small-footed ladies have to endure higher pressure and more distortion on our already less-stable foundations.
Sadly, heels can look fab and add some height to the height-challenged like myself. I just don't think I will ever add another pair to what I have. Fortunately, the range of stylish, walkable shoes is much bigger now than it ever was. Phew!
(Oh, and I SO agree with those who listed pumps. They almost NEVER fit my darn foot. They gap and just don't stay on. I don't understand how others can even wear them!)