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I disagree with your conclusion. It's on teams to get better on maps. I would bet anything that teams aren't yet putting in extra time on their bad maps. They need to, but they are reluctant to mess with their scrim schedules.
Each team has a set amount of time. Say you're 20% against Boston on Assault but 50% on the rest. No team will prioritise beating Boston on Volskaya and get an extra 10% rather than put that time into another map.
