It's largely about footing (heel then toe) and to the individuals particular heel tolerence. I have some very high heels which although narrow at the end are very solid under the heel which helps with balance and co-ordination. I have a couple of pairs that are purely for posing in and for nights when I am being delivered to and from the door of whre I'm going and expect to be sitting for the majority of the evening.
Do you have any other shoe related questions I can help with?