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.
