I just finished my first playthrough and went with Shadowheart as my partner, and it was a truly wonderful experience, but the one thing I was disappointed with was that at no point in the romance was I given the option to tell her "I love you." I've seen clips of Karlach's reaction to saying "I love you" to her, and it's such a cute moment, I wish I could've had a moment like that with Shadowheart, to see how she reacts to being told that in no uncertain terms as opposed to the usual coy flirting. Honestly, it should be available for every romance, given the weight those words can have in any relationship.
On that note, I also really loved the new kissing animations added with patch 6, but if anyone at Larian is interested in my thoughts, there are a few tweaks and a few more additions I'd personally really love!
Firstly, and this doesn't just have to be limited to your romance partner, but it'd be nice to be able to hug your companions like you can at the reunion during the rest of the game, when they know you enough to agree to it of course.
Secondly, the reset to standing apart after a kiss is a bit awkward, so it'd be really nice if each kiss would pause while you're still close or embracing and give you the option to keep kissing which can be selected repeatedly, pull back and keep talking, or leave the conversation. Similarly, hugging could pause while you're in the embrace and would just need an option to pull back for when you want to end it.
Thirdly, it'd be really wonderful to have the option to cuddle with your companion while you're at camp, but I totally get that that's probably the biggest ask cuz it'd require more mocapping and even more dialog to be mocapped in that position rather than the usual standing face to face positioning unless you implemented it with no dialog.
If anyone else has any thoughts or suggestions of their own, I'd love to hear them!