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The whole purpose of IVs, natures, and EVs in the first place was to make two Pokemon of the same species look clearly different. From a role play stand point, anyway.
Even though these stats are easier to control now than ever, the impact of IVs in competitive play should be reduced. I don't remember anyone saying "boy, riding around the eifel tower for a couple hours each time I decide to raise a new team sure is fun!"