Calling 2002-17 a "weak era" is absurd, and here's why:
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I posted that in another thread, and while Elo has its limitations, it does a fairly good job at showing the level of overall talent.
The "weak era" was early 90s to early 2000s, with 1997-2002 being the weakest (so it is weird that Fiero starts his weak era just as the field started to get a bit stronger). With the arrival of Roger and Rafa, the talent pool got stronger, then much stronger as Novak and Andy came into their own.
And more to the point: the era includes ALL players, not just everyone but the top guys. Not to mention, there were still good players alongside the Big Four, but they looked weak in comparison, because the Big Four were so damn good. 2012 was very strong, with six players at 2300 Elo or better - the Big Four plus Ferrer and del Potro. That's the only time six guys were at 2300 Elo at the end of the year in the Open Era.