What whiplash? I'm way more invested in this particular problem and this character than any person should be in a fictional character. I search this stuff every day multiple times a day on Twitter, Discord, Reddit, etc. Yes, there are a few people here and there voicing their distaste for it but the overwhelming majority is in favor of it. They refuse to see the horrid inconsistencies of the situation often citing a throwaway banter line about preferring short-term engagements back in act 1 as proof or her flirty dialogue with characters BEFORE you are even committed to each other. Mind you a lot of characters have flirty dialogue with each other not just her. I just don't see the uproar that I feel it deserves and a big part of that is because if you argue that you want her romance to be more monogamous, that the scene on the beach actually have meaning, you're just an incel or you're trying to control her and other things of that nature.
I would say the most sensitive topics are : Endings>JusticeforKarlach>Minthara>Halsin(adn SH interaction) as it stand right now. Its not that bad, don't give up just yet.