I have wanted more companion content in general in act 3 for a long time. The content we do get is great, there's just not enough of it! I love Astarion's graveyard scene... but I wish there were more ways to enjoy this progressed romance than just repeatable kisses, and for spawn Astarion it's just 2 kisses. I don't know how... perhaps it's just more companion cutscenes and conversations in general that would make act 3 not feel so quiet. Selune Shadowheart is a very sweet character, so more validating from her to her partner makes sense. I've never romanced Shadowheart but even as a friend in the epilogue she is the sweetest person at the party. It makes sense for her validate her romance just as much as Karlach does. I understand why someone would want more.