This manga is pretty clearly anti-late-capitalism, I have no idea how you could be getting it being pro-capitalism.
People today tend to not want kids as often because they have no way to take care of them, not because they're feminists wtf. When both you and the person you're with have to work full time+ just to afford food and housing, it makes it a little difficult to have a kid while being able to give it the time a kid requires. The constant need to be working is also the main reason why Japan has a birthrate problem, and as you may know, Japan on average holds pretty traditional values, although many people to day are starting to break free from that mentality.
Being a stay at home mom doesn't automatically make someone a tradwife. A stay at home mom can still hold non-traditional views and practices that tradwives don't. The term tradwife refers to an entire mentality beyond just being a homemaker.