I do not think that romance really suits her. She is just so complete really, I am not sure what a romance with anyone else would give her.
I do not think that Yang really needed a romance, either. She at first was the most outward that could be a romantic dynamic. But her PTSD stuff kind of ruined that and that is healed by time instead of by a romance.
Blake has kind of been bland with her traits mainly just being fighting WF.
Weiss is the one who goes through the difficulty with her family company doing bad things.