Whatever you need to tell yourself. It doesn't upset me at all that people cling to hate and surround themselves with things they don't like. No where did I say I want an echo chamber of fan bois that only want something positive. Quit creating a strawman because you have nothing else of substance. I welcome, and always have, constructive criticisms.
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Given the engine age and graphical differences I highly doubt it could have easily been reproduced in a content patch. Sure they could have branded it as a Diablo expansion much like WoW has engine and core game updates each expansion. Though that might not have worked as well since D4 has some fundamental system differences like with the paragon system that would essentially mean character wipes for D3 if it was an expansion.