If Feast could endure duo premade in 4vs4, you can endure duo premade in 5vs5. In Feast I had 85-95% winrate as healer in matches. In casual CC I am happy if I can get above 50% tbh lol. To me it is questionable if duo would help me that much, you still will be at the mercy of the remaining 3 players pressing their buttons or not.