I'm not saying it was deliberate (i.e. artificial) selection, the selection was natural. I'm just saying, think on it more.
It was necessary in the past to be strong to survive and provide for your family
But you're saying those genes weren't required by females for some reason? Why? Honestly the only answer is: because it just happened to work out that way. The evolutionary coin could have just as easily flipped the other way and resulted in women being biologically predisposed to be stronger. We see this in many animal species, in fact.
We have a history of giving jobs to men because we've conflated their gender with other capabilities, not because they actually are the most capable. But my point is, we're smart enough as a species to not do that anymore.