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In my opinion, it's absurd to play with rematches without a prior agreement; essentially, one person gets a chance, and others won't even have a chance to catch up. And, consequently, I'm against changing the rules after a month of the tournament.
It's great to play well for 6 days, only to have a rematch after a match. Or, in a bad scenario, to look for a rematch. 2v2 games are organizationally more complex than 1v1, so this kind of pressure is unnecessary.