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If this was transmission to a single client you were right but when this is used for broadcast or multicast there is less interest to minimize the transmission for each client but rather to optimize it for the entire population at once, since in these cases feedback is scarce in the first place there is little reason to check at every message, it is sufficient to test it once in a while anyhow.

I can see also use cases for this in a unicast transmissions but even there the idea would be about simplifying the communications layer, for example in the case of usage for a fixed rate transmission and with complete disregard for the loss rate. Not sure what I'd think about bandwidth usage and the stop criteria in this case.




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