I generally think that's something that would be adjusted about the interactions if they did fix Halsin's Act 3 characterization so that's just me not thinking it needed to be specified separately.
If they "fix" Halsin to have his poly make sense, it's not automatically "fixed" for other companions (Shadowheart/Astarion). They need their own justifications, which they do not have right now, in the slightest.
I just have enough faith in the writers' abilities to assume if they fix an entire characterization arc, they'd adjust what kinds of reactions there are to it (I expect a similar amount of work/change if they were to finish developing Karlach's quest in Act 3 instead of just leaving plot devices for it all over the floor with no way to use them). But maybe that's closer to the big ambitious hope.
