Ah ok, cool, thanks for the clarity. I understand GW2 has a similar gap - around 5-8% between a brand new character, and a literal full bis character. Strange that so many would claim "you cant have an mmo without gear progression" and yet two of wows biggest competitors have extremely minimal gaps. To be clear, im not claiming an extremely small gap is the same as NONE, but it does show there is an apatite for much closer gearing.
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160 people have voted - like 20 people have commented - that means you have relied on extensive assumptions and extrapolation from a tiny sample size.