As if Act 3 Halsin isn't already a parody of who the character was in Acts 1 and 2. If they rewrote all that to at minimum be more sensitive to the subject matter they insisted on sloppily throwing on him then sure maybe there's a good case for going back to the very old idea that they scrapped. But as he is I would vastly prefer the ultimatum scene because it adds something meaningful to the game in its current rather than distant past state and adheres to the stance they'd been vocally keeping that they want the two to be mutually exclusive (and would conveniently solve the tent problem). Also by virtue of it already being written would be less work than working out a bunch of other interactions to make it make sense for Halsin to actively tolerate her. It probably would've made a lot of sense for him to tolerate her with the original plan when he considered himself the cause of the Shadow curse but with that massive change I don't see it anymore. It's also just kind of fun and on-brand for a Baldur's Gate game to have incompatible characters, though the old games were certainly more bold about how it worked.

And there's the worst case scenario if they did make brand new lines between him and Minthara where maybe they dive back into Halsin's experiences with drow again. No one wants even more of that except his most problematic stans. I certainly don't even want to risk that possibility.