Your argument smacks of insincerity due to its limited scope of viewing SAHMs as moms providing childcare.

1/ You haven't mentioned how that SAHM must get a cooking credit, healthcare, retirement or house management credit or anything else in the litany of jobs required outside of immediate childcare and costs incurred by simply existing as a woman. Just a voucher for the hours, I assume, at which childcare would be open and none of the other hours

2/ A SAHP (thats stay at home parent) should be incentivized by raising wages and allowing life to be more affordable but your argument seems to be very focused on "moms" and "capitalist enterprises" and does not consider the reality that when SAHMs were more economically viable, it was not viable for all families.