So, if I understand you correctly, the new Romance Dynamics (Steamy, Strained, Unpredictable, Wholesome) don't really do much of anything. The only effect Lovestruck has on legacy game play is that it makes finding a spouse and maintaining a happy marriage more complicated, which can be seen as a positive or a negative depending on preference. It does have level up mechanics, but those aren't very well developed, so not really an ideal pack for that sort of thing.
I don't care about the new fears, since I keep wants/fears turned off, but losing the "regulars" from the community lots would rob those lots of part of their appeal.☹️