Hmmm... IMO you'd have to admit that an (arbitrary?) 10KB cutoff for what constitutes "useful" is subjective, not to mention debatable - though I'd almost have to say that it requires an even more subjective definition of "useful" that takes the subject matter of each article into account (even if we're limiting ourselves to BLPs). But how you'd establish and codify a methodology for that, I have no idea...
Still, I personally think these numbers are fairly consistent with what we see and, to some extent, hear about anecdotally. What's more, the statistics that come out of the WMF and Wikipedia itself rarely take things like "mass-stubification" into account - put it all together and it suggests that WP's growth hasn't been anywhere near as impressive as they've been saying, and the decline in their real growth rate has probably been going on a lot longer than they've let on.
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