What you describe is uncannily similar to a couple I knew. He went along with marriage and children, who knows why as he was remarkably ill-suited to them -- I think he thought that's just 'what you did'. He certainly, by the time I knew him best, thought of women as the people who made men do things 'for their own good', but had completely checked out of parenting and family life.
His excuse was work, that he needed to leave the house before 7 am to beat the traffic and often not get home till 8 pm, thereby handily missing getting children up and dressed, breakfast, school runs, childminder pickups, cooking and eating dinner and homework supervision. He often claimed he had to go in at weekends, too, to keep up with work.
The snag? He had exactly the same job as I did, at the same level of seniority, and I did it in three ordinary-length days in the office, plus two WFH, and I never worked out of the house at weekends.
Also, once his wife had divorced him, suddenly work was less of a draw. He started only working three days a week in the office, and much shorter days. Because now he could stay at home and not be bothered with parenting.
I'm no longer in touch with his ex-wife (who had all the parenting and household work fall on her while also holding down a demanding professional role), but it seemed clear her life dramatically improved once their marriage was over. Even though his half of the 50/50 was more like 30%, he was still compelled to do far more parenting than he ever had, and she had a chance to catch her breath.