The constitution still has women in the home
I don't think the Constitutional position changed the position for women in any way. The "marriage ban" was there well before the Constitution was enacted. And the relevant clause declares :
“The state recognizes that by her life within the home, woman gives to the state a support without which the common good cannot be achieved.” And that “the state shall, therefore, endeavor to ensure that
mothers shall not be obliged by economic necessity to engage in labor to the neglect of their duties in the home."
This provision was not "regressive" for its time. The marriage bar was still active in the UK then (and it was from the UK that we inherited it). Perhaps one could say that the most striking thing about this provision was that it was ignored, ie, nothing was done to support the women/mothers in the home economically - they didn't even get state pension credits.
I am not at all arguing that the marriage bar was not discriminatory but it needs to seen in its cultural and historical context. The UK Foreign Office ended their marriage bar in 1973 at approximately the same time as Ireland (1973) and for the same reason - to comply with EU law. It was not in place because of any "constitutional provision" or from the influence of the Catholic church. More generally the UK ended its marriage bars in the aftermath of the Second World War - the impetus was the labour shortage in the UK at the time and also the reality that women had been a mainstay of the domestic workforce during the war years. It was not "progressive thinking" that led to the change in the UK but the changing social and economic context at the time. The context in Ireland at that time was different.
I remember the controversy about the removal of the marriage bar in Ireland. My mother was very much against its removal. It was not from a position of privilege - we lived on a small farm and my mother worked hard seven days a week, both in the house and on the farm. Perhaps, it was that she had 5 sons. And that she had seen many of her own family disappear through emigration because of lack of opportunities at home. She feared that the ending of the marriage bar would worsen the situation, with privileged two-income households closing off opportunities to those who were less privileged and influential (who would end up with nothing at home or have to emigrate). I don't recall my father having any strong views for or against the ban.
I am not in way suggesting that the ban was "right" or indeed "wrong". But it needs to put in its historical context. And I am certainly glad it ended.