It's true, but people don't understand the beauty of wife appeal (Ultima pay attention). The reality is that Saori's appeal is almost entirely in her perfect wife potential. Saori could make you dinner, tend to your emotional needs, and rear as many children as you could ever want. She could be your one and only woman, but when you just want to fuck, you would obviously use one of your mistresses. Ideally someone younger and tighter like your girlfriend's daughter, or your niece. The problem is you can't take your niece home and have her make you a meat and potato stew for dinner and then eggs in the morning. That's why Saori is the best out of the GuP team.