I'd think that if there are parents who do what you describe in your question it's most likely, or often, that they don't really understand the extent/depth of role of parent beyond, say, making sure kids are clean and well fed and/or the fact that, as you say, kids are kids and parents and parents; and even once kids are older there's still a very different set of responsibilities and different perspective of a parent in the family and of the siblings that are a part of that family.
Every "group" of people in a family can be different but can share things and have a perspective/picture from that place of the thing that amounts to the title of the category of that group. Siblings can share a "picture" and things that happen from that place in the family that's separate from the "take on the matter" that parents (correctly or incorrectly, sometimes depending on the kid involved). So they have a "fresh take/perspective" on things from within that role/category.
In fact, in fairly recent times I realized that people in the category of "cousins" can, once they're all old enough, realize that they can share their own "category's worth" of experiences as kids. Then, once they're all old enough to be beyond the things that generally mean cousins grow up and become more distant, they, too, can bring a new perspective and even accuracy to the picture of family members and childhood. Cousins are, of course, extended family but are often a big part of the "kids-in-the-family" picture.
If you think in terms of "forests versus trees", the people in the category of "kids in the family" are the trees and can see things from the perspective of a tree, rather than seeing the forest. They can also look around and see the trees that are nearby and see things that the parent(s) How accurately they see some things can, as they say, "depend".
Parents "forest" of their own, little, family. Some see (and present) things to the "trees" fairly accurately. Some don't (either because they won't or can't). Still, the role of parents is to aim to see, be, and preserve that "forest" of their own family.
Kids of families grow up and often start their own "forest". Parents die off. The former kids of the family share one set of things/perspective. The former kids "from nearby forests" (cousins) often share their own experiences from yet a different perspective..
The parent(s) of each nuclear family, though, has to AIM to see each tree AND the forest too.