Talking to a lot of people (bit you) i felt it was more the latter.
Toddlers though... toddlers are fun. Not always, but a lot of the time. Once both of my kids cleared the baby stage I finally would describe myself as a proud parent, mostly happy.
Now we are empty nesters and both of my kids live far away and are doing great. With the space that leaves I've spent some time thinking about myself as a dad and boy do I have a lot of regrets. I don't think I was very good at it.
I understand now why so many people who weren't the greatest parents get very excited about grandchildren. I know if that happens for me, I'm going to be a much better grandparent than I ever was parent.
The main character confesses that twice she has wanted to give up her child for adoption. Another mom laughs... "Twenty times would still make you an amateur."
The point is: it’s not all love and adoration.
I experienced this so strongly I spent some time actually writing a poem (in Spanish) about it: https://alejo.ch/39l
As a childless person, the inverse is equally true. I have wildly different levels of obligation and constraint - and that difference typically becomes obvious very very quickly. I don't say that as a better/worse, just different.