I've never had an issue with the idea of female predators having breasts or with them lacking them. The only issue I ever had was if they were comical/overly huge for their frame.
I always figured that the females would be much leaner/more agile/used different hunting styles than the males though. I think Hunting Grounds hit a good spot design wise, and I'd definitley want NECA to make one so I could get more variety among my preds.