I'm guessing the idea is that the faster the weapon, the less rounds it takes for you to see a guaranteed return from the haste. I.e. getting an extra attack round in (excepting killshot, which always = return from haste) or swinging before another person's attack round when otherwise you would've swung after.
Edit: Meh, nvm, I think he was maybe making a point about the roundings used in formula? No clue really...
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