I think you misunderstood. I didn’t say that men have it easier. I said that men often seem to think that taking care of several very young children is easier than women think it is. I suspect the reason they think it is easier is that they aren’t usually the one doing it, at least on a constant basis. And as another poster pointed out, men are less likely to be alone with all their children at once. If they are home, the wife is usually home too. Even in our home, when I’m planning on leaving the kids with my husband for a few hours, they are usually already in their jammies and fed, or dinner is prepared and just needs to be heated. I basically have as much done for him as possible so that things go smoothly, because he is not used to having to do all those things and I don’t want to come home and have to do extra things that should have already been done in addition to the things I still have to do! (If that makes sense.) In other words, he’s set up for success, so yeah, it probably does seem easy. I KNOW that working a fulltime job to support a family isn’t easy because I do that too, so that isn’t an issue for us.
You are correct that mothers of more children tend to express frustration less and that’s probably due to the mathematical necessity that in order to have ten children, you’ve most likely been parenting at least ten years and more likely closer to twenty. A mother of one or two children often has not been parenting as long and is still learning. I suspect that if you went back in time and spoke to the mother of ten when she was a mother of two, she might complain more. And we all know the grandma ladies whose kids are already all raised to adulthood who like to boast about how they never had any trouble when their kids were little and today’s mothers are just soft.
I agree with your last statement that many non-parents entertain regrets about the road not taken, but then again I think most parents do from time to time as well. It’s not a good habit to get into for anyone, but I don’t think there’s any particular walk of life that’s immune to it.