The one "correct" argument against ack-filtering I've seen is that it encourages (or rather validates) the use of extreme asymmetry ratios.
However, these extreme ratios are already in widespread use without the aid of ack-filtering. Even ADSL2 Annex A has, as its "ideal" sync rate, a 16:1 ratio, which Annex M modifies to under 10:1. I fear we must conclude that technical considerations are not the driving factor here. A better place to sort out the asymmetry problem (as well as several other problems of current interest) would be in a free, competitive market. Sadly such a thing is rare in the telecoms sector. - Jonathan Morton
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