Responses
I think this isn’t reincarnation (not reborn as a kid), it’s transmigration or isekai since he went into a story). There’s reincarnation/transmigration that does have the characters be one dimensional since that’s the point: mc goes into a story, aka story characters will be what they’re written to act as. Though you may be more used to only seeing stories where they treat the story characters as real people
Yeah, you can tell the mangaka hasn't read any reincarnation stories.
I'm kinda disappointed the story went the same route it originally did, with the seme switched out. It was funny how desperate he was, but the uke ended up being super bland and 1-dimensional