A lot of them seem to have the MC actively being in a relationship with his harem, to the point of making love and taking them as wives.
I think the point they were trying to make was that the many harem stories depict relationships in a fetish-y, trope-y sense. Yes there are many harems where the MC sleeps with a bunch of women and has wives, he is
sexually involved with them, but that MC never actually experiences a relationship with these harem members that has any depth beyond that, or that said harem characters A/B/C fade into the background after they have had their 2 chapters of screen time and SMUT.
Furthermore, they mentioned the trope where characters that are portrayed romantically for some reason change their personalities when 'in love'. It's not just a matter of acting a bit differently, but that the ice-cold, ruthless female general is suddenly a helpless and horny tsundere as soon as the harem MC enters the room or perhaps touches her shoulder. She is unable to do anything except wallow in her own pleasure.
These are the kinds of stories that pursue a more wish-fulfillment, fap material kind of fantasy, and not a story where the romantic interest(s) have a role beyond a sidekick, if they are even graced with that much.
There are probably some harem isekai that do have a wonderfully fleshed out harem, where each character could stand on their own/is interesting, but I doubt it is the norm.
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Ah, I see. I certainly hope that wouldn't be the case for my own story.
I mean, I ended up not adding the typical slave girl waifu character into the harem because I can't figure out a purpose for her other than just fawning over him after he saves her.