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Well, I think one thing that they changed is that Sword Spec no longer procs itself, and I believe that's true of some of the listed items as well - which is why we had all been assuming it was equally true of Windfury (which turns out to be an unsafe assumption). So I think that theory behind such a build has been nerfed somewhat.
That said, it is true that if you get enough extra attack procs, you can theoretically start generating disproportionately large amounts of damage. For instance, if each swing has a 10% chance to generate an additional attack, the expected number of attacks you get per regular swing is 1.11; if you bump that chance up to 50%, the expectation climbs all the way to 2 attacks per base swing; and if you get get it to, say, 80%, the expectation shoots all the way up to 5 attacks per base swing.
So, what we draw from this is that extra attacks do exhibit positive scaling with themselves - that is, the recent discovery regarding Windfury increases the relative value of Blinkstrike and Sword Spec - which is certainly something to keep in mind. On the other hand, there really aren't that many good sources of extra attacks - I mean I'm going to make you eat my shit, you have Vindicator's Brand as the best available MH... and nothing else even remotely competitive. Hand of Justice was a nice trinket back in the day, but it doesn't compete very well anymore, and even with the positive scaling of extra attacks I just don't think it's anywhere close to catching up.
Now, stacking extra attacks in this fashion *does* increase the uptime of PPM effects - but again, I don't think there's enough to make this increase significant.
Hence, while we should keep an eye out for more extra attack abilities, and we should remember their scaling properties should such things exist... it's also true that at the moment, there's little practical application for this knowledge other than tweaking some EP values.
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