I don't think that's true.
Women now aged 50-70 now had mothers who were broadly at home when their kids were.
Naturally those women went into motherhood with a certain idea of what it would be like, based on their own childhoods. But their own experience of mothering was much, much harder. They were financially required to work outside the home to a much greater degree than the generation before them, while still shouldering exactly the same burden of Woman Work. They were much more likely to be geographically distant from their own parents. Those parents might themselves have been, because of how society was changing, less supportive as grandparents than previous generations.
It was exhausting. It was enraging, for those of us who could allow themselves to see (internalised misogyny meant many didn't) how our husbands were not going through an equivalent shock and were somehow able to avoid stepping up in any way shape or form (for those of you who have never quite understand what 'the patriarchy' means, this is a good example of the patriarchy at work).
When you add in a generation of kids who have had - because of the era in which they themselves grew up - far greater likelihood of MH problems, and are facing AI and all the horrors of global capitalism, and might never leave home - we're just fucking exhausted.
I've devoted my life (with my own ND issues) to my children. I have nothing left to give. I absolutely dread either of them having children as I know my socialised guilt and my absolute love for them will mean that I will once again not have a single pathetic moment to be quiet, to be myself, to think what might actually interest me and do it.