Why don’t all sports just have competitors and not be split into men’s 100 meter dash, and women’s 100 meter dash, etc.?

Well, I thought if I should go with Fluther-friendly fare and dish out the fluff, but the day is well spent and no time to waste time on that. But based on some recent threads, and some years back, why do they not have just THE 100 METER DASH, and if you are a runner, you enter. If you are fast, you get to the podium, same with racing sculls, ping pong, pursuit cycling, etc.? After all, it has been pointed out some women are faster than men, so if they are indeed fast they should be able to hold their own. Certainly when you have machinery working for you as a bobsled, cycle, or sailboat it should be even easier to hang as just ”a competitor, do distinction”. To make this a totally equal world, why not do away with gender divisions?