So in Act 1 - there are multiple scenes, I admit I have no done all the romances but just using Shadowheart and Karlach as an example but first you flirt, get a set-up to romance scene like "hey want to do something?"
For Shadowheart her romance scene is a kiss by the waterfall.
For Karlach a kiss as well but with her heating problem it it becomes an interesting issue to resolve.

Act 2 - the whole situation has changed yes, and for Shadowheart there is not much to explore. Especially as her lover in the Gauntlet. After the Gauntlet we get a "wait for now" message.
For Karlach we go to the next stage. Which is great honestly!

Act 3 - now this is where I think where we should have had the most romance content is feels like its too little and too fast.
For both Shadowheart and Karlach they confront their old abusers and I know depending on previous decisions things could go differently but still there is only one romance scene.
For Karlach the date scene and for Shadowheart the Swim scene (or the statue scene if you are evil!)

And thats it!
In the finale where you are facing squidification there is not much to discuss between the romance partner and yourself.

I know the recent update talked about some updates to that and new cute kiss animation but I feel like there should be a few more character development points between Act 2 and Act 3.
I think to remedy this there should be a "tiefling party" moment at camp for specific milestones between your character, the romance partner and the other characters in general.

For example a Camp scene after the Creche, another one after First Light discover, where maybe you can stay at the inn instead of its vicinity! one last one for after Ketheric's defeat.
In Act 3 there should be a specific romance scene for Elf Song Tavern, This scene should be before the romance finale, there should be a camp scene before you set out for the Elder Brain fight.

These camp moments are to show comedic moments like Gale cooking, or romance partner sneaking a kiss, or some conversations between the different characters so it really shows they are companions in an adventure rather that sentinels standing by their tent 24/7. I kept waiting for these moments to come about but they never did, or just barely. It seems as though as soon as things got good the game ended!
But this is my feelings on it, How about everyone else?