They don't want Halsin leaving with Tav because:

In the context of the other romances it doesn't make sense for Tav to be able to leave with both of their LI. It's just what was convinient - end of story.

He was clearly written as a joke for all the people who listed after outrages content (bear sex for example) and with the clear assumption that 99% of the players who romanced him would have a romance already.

Those numbers will also likely be correct, because most find it funny and horny - in a culture where diversity has suddenly been linked with sex more than identity.

In which case, Larian did cater to the majority instead of doing what they claimed to be doing - creating nuanced content for everyone.

But I find it interesting that you the one moment claim that the majority doesn't want him changed and then afterwards claim the minority.