As good as it is to try to remain as blizzlike as possible, the game is far from blizzlike just due to the infinite patch duration. The way stats have been designed, the way arena was balanced, and issues like multiboxers in full bis was never accounted for, because it didn't have to be. This game functionally feels very little like original wrath did. Many specs that people actually frequently used back then are basically no longer played period (assassination rogues used to be the majority in PvP as an example), the majority of the PvP population just plays human, paladins and DKs are way overrepresented, 90+% of the arena comps in the top 50 ladder are holy paladin/plate humans, the list can go on. Small changes would actually make the game feel MORE like Wotlk did than leaving it untouched as it is just due to people having so much time to learn and abuse the meta and the rules.