Wow that went down a little rabbit hole there.
My perspective is (as it's only a perspective) is that there's a big difference between a revolving door with new partners and a couple making the active choice to live together and build a family together.
The problem with I think what was put it insulates that this is common place. Maybe it is, I don't know but the posters who come on here and say I have been with DP for 4 years and we moved in after that often get the, "well that's nice you moved far to fast poor SC" and "this is why I would never do this to my children, selfish"
If assuming say those shaming comments are true for sake of argument that revolving door is being opened repeatedly by the dad.That has little to do with the SM or SMs
The second comment insinuates that the because of the children, parents are not allowed to human in their own right. That's some type of insta glossy bollocks right there, The needs of a child must be met, the wants of a child need to be looked at by a case by case basis. Which is often actually shown the OP and DH has done that.
These words are applied regardless of what the OP has put.
Just because you don't do what a child wants at all times isn't a scandalous thing or a bad thing. And by the nature of the posters here people who do move in too fast without considering the kids, are unlikely to come and ask for advice on MN. By nature these are people who have considered things or they wouldn't post.
It's important to note that we can't tar everyone with the same brush.
Accountability has to be put at the door of the people who created the door.
Blending works for some, part blending works for others, keeping it separate works for the other set.
If there was magical book that said move in after x time on here we wouldn't have as many ding dongs. To assume people wouldn't consider the children involved is fairly dumb and it's always a move in after a week type job is just a bit mental.
In my view.