Hail is actually the opposite of overcentralizing as it introduced a huge amount of new threats and viable mons like the aformentioned Walrein and Duosion but also underused mons like Glaceon and Rotom-F, nerfed mons like Musharna which actually did centralize the metagame and changed the physical attacking bias to increase the importance of special walls like Regice along with the slight fall of mons like Amoonguss(which can still run a mixed defensive spread rather decently)
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