@TotallyAbsurd from my perspective the fact that there's been no real development on his part is the point... the world keeps shifting and changing around him while he's longing for ghosts and slowly losing touch
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"That time I got reincarnated as a boomer who's so stuck in his ways he can't learn sh** and only repeat the same thing everyday" would've probably been a better title at this point, heh.
All jokes aside Kaeha's kinda been used and abused for the sake of this plot point. So the boomer isn't MC, but the author who has such a hard time coming up with stuff to write, he only recycles the same stuff over and over