Honestly, although they are reincarnated and so-called have the mind of a 25 year old, right now they only have both a body and mind of a 5 year old child. In theory, their brain isn't fully developed yet, so even if they are able to understand things adults can, they still act and think like a child. This is simply because the mind isn't capable of having the functions to think more of an adult, because they aren't developed yet. Furthermore, they received trauma since they were born + being in an unfamiliar world, their mind are wired to induce those thoughts and actions to protect themselves. Having memories of your past life does not make you op af, having to learn about the world they were never familiar with isn't easy, much less having to suffer from those traumatic experiences the moment they came into this world. Everyone view things differently but there is no need for y'all to be so toxic. Sure there are flaws but there is nothing perfect in the world, no matter how perfect they seem. If y'all don't like it/drop it, that means y'all are done and over with it, but here y'all are, still reading this. I do admit that the plot isn't that well-done and yes there's really not much advancement, eg.theres really no reason for them to be portrayed as isekai'd, the story wld be better if they are just normal 5 year olds.
but please, there's no need to make things difficult for other readers as well.
Thank you for reading this far, hope y'all have a nice day