The reality is that the atomic family model is antiquated. In our society, the individual is the unit We must therefore make the individual strong, meaning that we need to support both parents independent all the while having children.
We can observe that the old model was better in terms of a certain metric, but that's not going to help. We need to invest in making child rearing effective in today's world.
The atomic family model is not antiquated. The majority of the country follows that model with research demonstrating that is the best path for success.