We had times when I worked full time that work commitments clashed. When DS1's class was affected by industrial action, I had to collect DS from school at lunch time, and teach with him in my classroom, which frankly was an embarrasing disaster when he found he's got a willing audience of 14 year olds. We had childcare paid for 3:15 to 6pm but nothing to bridge 12pm to 3:15. We have no local family. Our local friends have their own work commitments. When I had work commitments beyond 6pm it was difficult to cover them if DH wasn't around. Some employees get more influence in their work commitments, some people actually do their jobs 9-5. I didn't have influence in mine, when DH's come up they're often short notice and based around multiple diaries and travel connections. "Sorry, my wife's got Open Evening" doesn't wash that well and they'll contract someone less flakey. TBH just the toll of childcare in a crowded 8am-5:55 pm 5 days a week was pretty crap for DS. Then there was a couple of hours of dinner/ bedtime, then it was back to work again, and possibly setting the alarm extra early to finish off before the DCs woke.
With no external support and only a fixed after school club avaliable, it was very difficult to give DS the time and environment he needs and put fair effort into the demands of our jobs. We didn't know at the time that DS has additional needs. He needs stability and quiet time to unwind. Every family has their own set of circumstances.
Could I pick up family-friendly part-time work? Probably, but why? We don't need me to, they're thin on the ground, other people do need it more than me. We live comfortably and our choices have zero impact on anyone else. We are aware of the toll on my pensions and have arrangements accordingly.
Ultimately we are happy with the choices that we've made in the circumstances we are in and they make bugger-all difference to anyone else. Most of my friends who have maintained their careers have family support that spreads the load a little and has a bit more flexibility. They also have neurotypical children.
I don't know why people find it so hard to comprehend that people have different circumstances and therefore make different choices, especially when those choices have no impact on them.
Not all jobs are the same. Not all families are the same. Seems pretty easy understand to me.