@wombat15 equalisation came in in 1995 so not really the early 90s, and besides, the issue is not so much equalisation, it's how and when it was done.
This page gives the best summary I've found of the various changes.
http://www.web40571.clarahost.co.uk/statepensionage/SPA_history.htm
It shows that there were only 4 changes between 1908 and 1995. It was normal for there to be a change from time to time. It was not normal or expected for there to be a succession of complex changes. It's clear from the discussions on this thread and others that those changes and their implications are still not fully understood by many, even now with the benefit of hindsight and in the information age, and I can absolutely understand why the Ombudsman concluded that people should have been informed individually in good time.
Once equalisation had been decided in principle, any further increase in the retirement age was always going to hit women harder than men, because women were already trying to make up the 5 years needed to equalise, and they had a limited time to do it. In 2007 the age increased to 66, to be brought in between 2024 and 2026. At this point men had one year to make up, women had 6. The better informed planned the best they could, but there was another hit in 2011 by the rise to 66 being brought forward to 2018, even though the coalition government had previously said that it would not come in till 2020. Revisiting already stretched retirement plans to make them stretch over two additional years was just not possible at that point. This is why I support compensation for that particular subset of WASPI women.
This page of the Ombudsman's report summarises their conclusions. https://www.ombudsman.org.uk/publications/womens-state-pension-age-our-findings-department-work-and-pensions-communication/summary
The previous few pages are worth reading too. Till I read them I had had no idea that many the communications that did take place had been incorrect and misleading as well as late. Here are some extracts:
107. An internal DWP memo from November 2006 refers to a survey that year that found 50% of women whose State Pension age was between 60 and 65 thought it was 60.
114. The proposed schedule for issuing letters included women who turned 60 between April 2010 and May 2015. We have seen no evidence of what – if anything – DWP proposed to do to tell women who turned 60 after May 2015 (whose State Pension age had increased to 65 under the 1995 Act) at this stage.
157. DWP began writing to people affected by the 2011 Pensions Act within a couple of months of the Act becoming law. An effect of the maladministration, however, is that letters were not issued unsolicited about the effects of the 1995 Pensions Act until 14 years after that Act was passed. A 2016 Work and Pensions Committee report notes that Paul Lewis (a financial journalist) had calculated that letters informing women about the effect of the 1995 Pensions Act were received, on average, one year and four months before they turned 60.
Many of the WASPI women have a legitimate grievance. They will not be compensated for it. That is an injury. To tell them they should have known, they don't deserve it, or that others have it worse only adds insult and adds fuel to the intergenerational conflict.