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Consider:
In a league with everything else equal (50% home, 50% away), ONE team builds themselves completely tailored to their home park. They do this in such a way that they are much more effective at home, but much less effective on the road. I don't think we need to argue the potential for this to happen, it's fairly common, and possible. This ONE team will have a better home WP than road WP. BUT, when they play on the road, that will improve every other teams' home WP, and when teams play them at their park, it will lower those teams' road WP. Just ONE team can skew the whole league in this very simple way. If multiple teams attempt to become better home teams, this only further increases the skew.
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