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It hasn't been my experience. There could be a few changes to the leagues over time that has sparked this; more elite starters moving from the AL to the NL and not so many moving the other way (to the AL), more elite hitters moving to the AL and not so many moving to the NL, the influx of new talent coming into the league is much better in the AL than in the NL, or even aging pitching in the AL compared to the NL. Even a slight combination of all four could have a large effect.
Historically, since the DH came into play, the NL has always had a lower ERA (because pitchers get to pitch to pitchers every 9th at bat). Weirdly enough, this year (in real life) they are almost identical. This has been coming for a few years (getting closer and closer between the leagues), and this year, it's come full circle. Logic says that it will normalize at some point (back to the ERA in the AL being about 0.25 points higher than the NL), but for now, it appears we are riding an anomaly. These things happen in baseball (history says so), and it's not always apparent why, at least not to the naked eye.
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