Obviously, men don't need to work and women don't need to take care of the kids (above and beyond what's biologically required of them), but (1) on average, outcomes will be influenced by underlying biological reality, and (2) it's a fantasy thinking that people can take time off work - e.g. a poor family with a newborn, you really think that any parent will take off more time than they absolutely need to, biologically?
Finally (3) yeah there are possible social levers we can use to counter this biological reality and enforce equality of outcomes, but ultimately, we need to decide what we want - why is women working more better than women spending more time with the children? Personally, I look up to Netherlands, one of the happiest countries on Earth, where many women work just part-time.