I suspect that a lot of differences of opinion come from the way people are defining a pension. To me, it is a gratuity for a lifetime of work, not a benefit for reaching a particular age. If someone has worked for a company for decades it is not unreasonable to expect to be paid a smaller amount in older age when working is no longer possible. The State Pension formalised the way in which benevolent employers behaved, and rolled it out to everyone in work so that people weren't destitute in older age. Rather than impose a charge on employers, NI contributions were used to pay for pensions, with qualifying periods and payments commensurate with contributions.
Nowadays a lot of people see pensions as a right rather than a recognition of years of working, and get angry when they see those who have paid in more for longer getting more back, and some expect to be paid a 'pension' with few contributions from work, or when the ones they did make were at a lower rate.
There have been numerous changes to the way SPs have been managed over the years, and inevitably there are people getting different amounts that they have been able to claim at different ages. It can seem unfair to see others getting more than oneself, but it is fair if we all get what we paid for and it stays the same (in real terms) as we were led to expect at the start. I do think that it is wrong to make changes that apply to those already in a scheme (eg the raising of the pension age by 6-8 years) as it can be impossible to make changes to financial planning that were made in good faith.
It is reasonable for women to be annoyed at the way we have fallen behind men because of historical laws and culture that meant we are less likely to have full contributions than male colleagues. I think a lot of people still don't fully recognise the link between NI payments and pensions, so are pleased when the qualifying salary for NI is raised and they don't have to pay, or are happy to keep working hours below the point at which they have to contribute. Unscrupulous employers will, of course, encourage this, so people can get to retirement age without enough contributions to get a full SP.
I think (but may be misremembering) that when I started work the Married Women's pension was being phased out, so newly married women couldn't join but those already on the scheme could continue. There was no option for me when I married, but I wouldn't have taken it if there had been - to me it was obvious that paying in less would mean getting less back, and I couldn't understand why married women should get a different deal from single ones. Back then there was also Married Man's tax allowance, and universal child benefit, so I suppose people were used to different treatment for the sexes, and of course it was perfectly legal to pay women less just for being female until the mid 70s, so maybe it wasn't as obvious then as it is now - we shouldn't forget that times change, and that we take different things for granted in different eras.
Occupational pensions are different again, and there are many reasons why the ' gender pay gap' works against women there, too, but it would be all but impossible to legislate retrospectively for those.
Given that historically there were many women who did not work long enough to get a full contribution record, there are going to be a disproportionate number of women without a full SP, or without the additional benefits that the OSP brings to many who claim it. Obviously those women can't live on fresh air, but the question then is how to be fair to those who did work and pay in, and also ensure that those who didn't are provided for. It would not be fair to give everyone the same, as is so often asked for on here, as people have made such different contributions.
I wonder whether there should be more separation between pension and benefits when it comes to older people, with a pension being a recognition of years of work and a repayment of years of contributions to the pension element of NI, and benefits being sums given to those who do not have enough to live on, for whatever reason. The two things could be treated differently when it comes to amounts, ages for claiming etc, but there should be absolute clarity about the differences. There will, of course, be people who have pensions who also need benefits, and there is no reason why that should not be possible.
People should be encouraged to remain aware of their pension status throughout their lives, so nobody gets to pension age expecting to get a pension to which they are not entitled, or to resent not getting the same amount as those who have paid more in.
I think marriage and/or baby bonuses had probably died out before I started work, but my first job was in the civil service and when I left I was offered my superannuation (basically my occupational pension contributions) back as a lump sum. That offer applied to everyone who left with fewer than X years' service, and would have been to save the treasury money, as they kept their contributions and saved on the index-linking of future payments if people took the money early. It didn't just apply to women, and was not linked to marriage or childbirth, although more women were likely to leave to live near their husband's place of work than the other way round. It may be different from the bonuses people are talking about, but it sounds very similar. I don't think it had anything to do with the State Pension though. In either event, by the time I retired I had more than enough working years to cover it.