I'm on maternity leave again, having had an extremely high needs baby the first time around (literally couldn't put her down - she would scream until she went purple, wouldn't nap unless on someone, I had to put her in a sling to actually use my hands. In her lifetime she has self-settled once). She's still like that. DD2 is nothing like her, hasn't been like her since birth, and I don't expect her to develop like that. I absolutely understand that with a baby like that it is impossible to do anything else - listening to that sort of screaming is enough to drive you demented and you'll do anything to avoid it.
Also, being a new parent to a young baby, ESPECIALLY if you're breastfeeding is a 24/7 job. You don't get to do your hours and clock off when you're done. Or have an hour's commute to listen to music/read your book/mess about on your phone in silence. Unlike most husbands, no matter how involved they are.
The rule in our house is that we both sit down of an evening at the same time. Everything has to be done, and it tends to be divided up depending on who fancies what, but neither one of us lolls about eating grapes while the other rushes around 'providing' for them. DH comes in, asks me if I fancy cooking, if I do he takes the baby and does pre bedtime things, if not then he cooks and i do them. We eat together, then I settle DD2 while he does bedtime for DD1. He comes down from bedtime, takes DD2, pops her in her cot, we meet on the sofa for gin and relaxation.
If I've had a good day with the DC or DD1 has been at preschool, I might get a more complex dinner or some tidying done. If I'm exhausted from a bad night or DD1 is being particularly trying, the house looks like a bomb disaster zone when he gets in. When DD1 was a baby it tended towards that - so we both got stuck in at weekends, in the same way that we did when I was back at work. Because some babies are more full time to look after than others.
I don't think you're being unreasonable OP.