Actually, that isn't true. At some point it might be, but right now it isn't.
For example, if the power grid dropped out in California right now, and all the men in the world disappeared at the same time, power would never be restored. It is not that women aren't capable of doing the job, it is just that there are not near enough women trained to do it.
It is the same in transportation, shipping, construction and the rest of the trades. Women could of course do the jobs, but right now there are not enough capable women in those industries to support the rest of society if there were no men.