Lulu is the cutest and luckiest girl in the world, I even really like this family and stor...

Lulu is the cutest and luckiest girl in the world, I even really like this family and story, but at least please, why are the stories I'm reading lately... About reincarnation, especially if they become children, always and almost all of them are underage and already working, starting businesses, or, even worse, directly becoming the head of the family. It is true that what possessed the little child in a story is a grown woman, of course I understand their thinking is far from that of a little child. But when they possess the bodies of small children, can't they do things like ordinary small children, until they're old enough? I mean, isn't that a normal thing to do? Because everyone who goes to the isekai world, they are people who suffered in their original lives, and start a new life with a better life., but why do they still have to waste their childhood even after being in another world... But again, it's just my curiosity, why do many writers create stories like the one I described above... Just curious.(￣∇￣")