I give up. I have really tried to explain it to you, and to offer help with your language barrier, but unless you're willing to understand what is being said this is pointless.

Yes, you're right. If you only see Halsin like a sextoy, then polyamoury and RA represented in the most toxic way possible is what sets him apart from the others.

I haven't seen anyone requesting a re-write, but more options so we can have the same variety like with do with the other characters in the game (redeemed or dark Astarion for example)
No one here has at any point said they want him to be like the other companions.

But yes, you are completely right. Under the premise that Halsin is a sexmaniac meme boy designed with the pure purpose of being a massive fanservice to kink and beastieality - Yes, writing him to be more nuanced would destroy that.