as i wrote here - Terrible fodder policy
solo players are just a fodder, a free elo for duo teams. If you are a solo player you are nothing more than a step for duo teams who are using you to climb up in ratings while you stay behind. Blizz just screwed up by adding any premade options in SOLO mode since it just granted big advantages to those who queue with skilled healers but put behind those who doesn’t have such healers among their friends or just playing solo
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