I agree, it was curious how there wasn't a lot of commentary from our companions in the final release.
Mind you, in my own personal experience, Shadowheart's dialogue did acknowledge your relationship directly after the fact. It also gets progressively more romantic, the higher her approval gets and based on other options later on, which makes it relatively easy to see that the romance is still active.
That said, you also have Withers eventually asking about your love life at some point during Act 2. That was amusing.
I see, thank you for sharing that! The "after the fact" dialogue still acknowledges the romance, thankfully. There is still the "we have something special" option. Interestingly, hers flipped from "Always good, with you." to " You know, I've always wanted to be a Dark Justiciar, but maybe I should just consider myself blessed to have you by my side" back to "Always good, with you" right after the party scene. I guess she got a renewed interest in the Justiciars after
Haslin mentioned we'd see them on the way to Moonrise Towers
Either way, I'm happy to hear things develop more in later Acts! It was just so strange to have a really impactful encounter early on, then at the big party when all my other companions want to "go to pound town", Shadowheart was surprisingly distant (a stark contrast from EA experience).