What's the reasoning behind the new 175-200 AA range for melee champions

Most melee champs have 125 AA range whether the model is small like Akali or big like Alistar, however: Tahm 200, as well as the expected reworks: Garen 125>175, Darius 125>175 and Morde 125>200. Why are new melees getting such a higher AA range? I don't think it's fair to other melee champions that have also been stuck with 125 AA range for years like these guys.
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