It's (almost) proven: high heels are a killer.
You can't walk in them; they wear you out. I've seen how G suffers in them. And most seriously, they can cause spinal problems over the long term.
If that's not enough, here's an incident that happened today:
Together with several thousand other cubicle drones, this individual - muar - was milling down the staircase at Clementi MRT. In front of me, this lady in HEELS tripped and also rolled down the stairs.
Tell me again why women's gotta wear high heels...