So, disclaimer, I love the weird races. One of my favorite characters was a deep-one hybrid alchemist I played in my skulls and shackles campaign. I love ganzi, I love tieflings, and I love aasimar.
My problem is that one of my players plays only aasimar, and I'm fairly sure they only play them because they hate not having darkvision, but also don't want to roleplay as a pariah. They don't use their angelic blood in any way, never comment on their relationship with the gods, and basically just play as a human with better stats, a spell-like, and darkvision. They have spoken of their distaste for races without darkvision often, and when I've suggested half-orcs, tieflings or drow they treat it like shooting yourself in the foot because of the societal implications.
Should I be trying to rope them into things based on their angelic heritage, and if so do you all have any ideas on how? Is this even a problem, or should I let them play how they want? They don't play tactically enough to be a problem balance wise, and I actually have to help them optimize their characters to keep up with the rest of the party, but that's not from their lack of trying.
I'd rather not ban stuff, but it feels like it weakens other player's stories when they play aasimar in the same group who are actually doing things with their race and kinda kills the idea that aasimar are rare and special when every one of our games has an aasimar in it.