I understand your point of view, but the game already have a lot of dating mechanics, for example, the firework event which you're able to choose a person to enjoy with.
An upgrade in the NPC's page could be really useful since you could take notes about interesting things about them as you progress in the game (For example, there could be a note in Bernard's page saying he likes to go hunting on X day, and later that he suffers from lycantropy)