In a race where the margins are so slim, surely there can be some marginal gains with the develop equipment better suited for the 100m?
Like for example, why do the spikes have laces? they could be cover, or have no laces at all or some people race with a relatively loose tanktops or even a chain, or bracelet.
Also, if you consider the tec that cycling is using now days with their skin suits, I'm sure sprinters can wear something like that. After all, they do reach top speed where wind resistance can be a factor.