I think it’s because 3+ DM threads violate a pick 2 of 3: unscoped context, individual voice distinguishability, thread integrity. Basically they are streams that possess meaningful but unpredictable state, and you have to maintain state without interruption or you lose the plot
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Slack channels give up unstopped context Large groups cause factions to form within which individuals can quickly clone states via sidebars and/or proxy for each other Twitter @ threads give up thread integrity: people operate with short, 1-3 tweet buffers
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