Here is a quote from Larian Studios AMA on NPCs romances
While romance is in, there will be other kinds of relationships: “NPCs and companions might become friends, partners, uncomfortable allies… or your worst enemies.”
Personally I would like to have NPCs romances in Baldur's Gate 3 this can add more depth to Baldur's Gate 3 lets say your romance lives in Baldur's Gate city and it is in danger this will give you more reason to want to keep the city of Baldur's Gate safe just to add that Pathfinder Kingmaker lets you romances NPCs and Pathfinder Wrath Of The Righteous will be adding more like romancing Queen of Mendev maybe she will show us the way lol
Cthulhu: FOR THOUSANDS OF YEARS I LAY DORMANT, WHO HAS DISTURBED MY- Oh its you... Warlock: Greetings my lord- Cthulhu: LET ME SLEEP-