i meant this in a non offfensive way, but does he have a developmental issue?
I'm not still sure what the author's intent is on this myself. We do know by his own admission that he wasn't regarded as the brightest crayon in the box in his previous life, but that could mean any number of things (before we even address whether that means anything for his current life).
But, I mean, conversely, the average isekai seven-year-old acts
way too mature for their age, no? Like if I think of the stuff I did when I was a first/second grader... Gosh, had I graduated from the leash at that point? Probably barely? (A full-body harness, not a dog leash if you're picturing anything weird like that; imagine some very tired parents trying to keep an fearless and ungovernable child from trying to run straight out into traffic).
In a lot of ways this guy strikes me as closer to "actual little kid" than most of these things ever get (disregarding the isekai stuff for a moment). Logic that seems absolutely sideways to an adult mind; worried about things that will later in retrospect be utterly hilarious if anyone remembers...