True. I feel like there are at least three aspects to this.
1) Most triple-A developers are male. They want to create art that reflects on themselves. They're also greatly influenced creatively by the media they consumed when they were young, which was aimed at boys.
2) Most avid gamers who purchase triple-A console games are male, as well. As far as I know, this is true. The "50% of gamers are women" statistic is true when you also consider mobile games. And trust me, mobile game studios are aware of this and develop games specifically aimed at women all the time. But the kind of triple-A action games that get shown off during press conferences at E3? Mostly male fanbase. So God of War, Call of Duty, Metal Gear, Battlefield, and so on. So there's a financial benefit to developing the kinds of games these devs would like to develop anyway.
3) As a result of 1) and 2), publishers are wary about female characters in big action games. Even Yoshida said they were nervous about Horizon's protagonist. This is mostly unfounded imo, as I doubt Horizon will suffer sales-wise from having a female protagonist.
So with this being the current climate, how likely is it that we'll see a big budget, triple-A game that deals with motherhood like TLOU and GoW deal with fatherhood? Pretty unlikely.
There's no quick solution to this. At next year's E3, the number of exclusively female-led games won't dramatically increase. It will happen, but slowly, as gaming becomes more mainstream and more and more women join the industry and become veterans at big studios.