I'm not sure that it is a bug, and I'm not sure that it is bad. Sure, I'd love to see consistency as long as the consistency benefits me. But suppose "consistency" knocks me down a couple pages and that same consistency keeps others steadily above me. Well, then I don't like it. :(
The WWW is well beyond what anyone could have predicted 20 years ago, and it grows every day in every way. Maybe, just maybe, "throttling" is Google's way of distributing traffic to sites that are pretty much equal. I don't know ~ I DO know that I believe it is real because it begs credulity to see such consistency in numbers from day to day simply because of coincidence.
So I go back & forth, and leave it to others to make the argument for its demise. In the meantime, I work on my sites to naturally get better traffic (in quantity & quality), and given how many people at this very forum report falling through the floor because of this that or the other, I see those months where the numbers are about as good as the months before as being a small victory of sorts. Or at the very least, it may be the best I can hope for under current circumstances.