Duo streak isn't meaningless, it's just easier to maintain. You get levay of couple of days using streak freezes. Life is hard as it is, I don't think users should be penalized for missing a couple of days. If it means more people can maintain their streak I think that good. I don't think learning should be a competition and if more ppl can make progress that's good. It does devalue your streak number if you consider it in relation to other people streaks, but why compare. If I am making progress and easier streak helps me do that I am happy.
