I agree, Maxis would probably say that they focus on both but their marketing and what they make sure seems to more girl focused. I think for example that their recent throwback fit kit has a few male CAS items and a few items for children, and the rest are female CAS items.
I think it would be a good idea to include more activities and animations that people would see as more "manly" we can't use the "you can use it for both" argument all the time. That will never allow us to go more in depth which makes it more interesting to play different roles.
Let me play as a male sim that is very manly and a female sim that is very feminine AND also let me play as a male sim that is less manly and a female sim that is less feminine when it comes to what the game can offer.