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We can look at this from a different angle: players who play matches faster than others will play against each other, and those who prefer to take their time will play against each other. I don't see any advantage in active players playing several rounds ahead and then waiting a month for the slow players.
And there's a psychological aspect: players who don't want to engage in arguments about who "griefed" more might blame not only their opponent but also themselves when they find themselves in such a situation. And blaming oneself is beneficial in life.