I think it's strange when people assume their parenting experiences are the same as others.
Would we assume all interactions and relationships are the same?
I did the night feed(s) between midnight and 6am and DH went out to work. One minute outside of those times he got up. I also did contract work at home so was not off work.
It was easy. Usually just one feed for me during the night. DH gave her bottle in the morning, washed up and got the rear sorted then handed her into me in bed, we had another feed then went to sleep. We would go out for the day then. I'd get a few hours work done in the afternoon while she napped or if we had stayed out in the evening when DH was home. It was so easy and I loved it. He was out of the house between 7.30am and 7pm. He took over then. We often went out in the evenings for dinner or to friends with her in the buggy.
At the regular coffee gatherings post new mum yoga and workout classes I'd look around and see the rest of the women looking deranged and thoroughly miserable. I kept my mouth firmly closed about how much I was enjoying it all.
Why? Because I just happened by some massive stroke of luck to have a baby who slept and was alway easy to settle.
So I was well rested and relaxed.
If she'd had colic or been an uneasy sleeper it would have been an entirely different story with me sobbing in the bed. I know he would have done the night feeds then. In fact he did them on the weekends. Now, he always takes me breakfast in bed at least one weekend morning.
So yes I completely agree OP. It's a shared responsibility. No mother should be sleep deprived to the point her mental health is suffering while her partner's whistles off to his big job in the city.