It's cool and all you only look at Arena from the eSports perspective and try to summarise it so briefly, but at the same time a lot of people enjoyed arena in TBC. It's another form of content. Not everyone plays Arena as an eSport.
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I think people who like Classic are just looking to the future. And no, you can't seriously think they'll ever do legacy BfA servers. What a ridiculous notion. They'll possibly do BC and WotLK, maybe MoP or Legion, as these were peak, beloved expansions.
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I loved PvP in TBC, I was meh about Arena, but didn't hate it. It was OK, just something else to do. To each their own. Kinda lost taking the OP seriously when they pulled out the cliche 'autistic' word as an insult (in this case claiming autistic people used arena as a barometer). Learn what autism actually is?