It has been argued that platform heels are more comfortable than stiletto heels and this may very well be true because your weight will be more evenly distributed over a greater amount of surface area. You just may be up so high that you look like a cross between a machine and a monster. Frankenbot. Anyways, platform heels give you extra height without harming the arch of your foot any more than any other heel would. They do lend women's shoe or sandal a lot more severity or intensity than you'd imagine. Just take a look at the runway shows of Fendi or Joseph Campbell's shoes.
The Modern Platform
Platform heels were really big in the 70s and worn by both men and women. They had a resurgence in the 90s, but really just because the clunkier shoe in that era, the better. Now platform heels are much more disguised and streamdress.