Minthara is not prone to outbursts, but when confronted with nigh impossible odds and almost losing the one she's come to value the most, I can very much see it happening. A thoughtless breakup leading to a follow up (and potentially a second, more emotional, romance scene) would solidify this as a great addition for me, but I'm aware this opinion may not be shared by many. For now, all we can do is wait. It's always fascinating to see people's different interpretations of her character :3
I think you did a very nice write-up about her fears! Even the strongest character can break under enough emotional pressure (and she is not at her best after everything that has happened to her since Act II). But I agree with you that this is not a view that might be shared by most fans and in the end it would be easier to just cut the scene out again as I don't think Larian wants to put in the resources to make this work properly (and I prefer that they fix her bugs).
With all the bugs it has caused I feel adding her for a good playthrough was not worth it. She was one of the few perks we got for an evil playthrough and now we don't even have that.
It is worth it, to me at least. I saw a lot of people paying more attention to my favorite character, and it got Larian to pay more attention too (albeit not that much in retrospect), so I am happy with their decision to add that possibility. I am, however, not happy about Larian's treatment of her character. As Crimsomrider has pointed out, this is completely separate :'3
Yeah, I was a bit cynical. I still think though that a few of the newer bugs are correlated to her implementation alongside Halsin (that she has no bed camp in the Elfsong tavern for example).