It's a game where you slay internet dragons for imaginary loot. Nobody stopped to care about the lore because it doesn't matter nearly as much as people who write 5,000 essays about it would lead you to believe. It's important, to an extent, but Jesus dude. Step back for a minute.
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I think a lot of people simply forget how bad the game was at the end of WoD. There was barely anybody playing. WoW had a lot to lose. Legion brought a lot of people back to the game but it's still nowhere near as bad today as it was back in WoD when players were making these complaints. You are 100% correct in that a lot of people aren't thinking for themselves but I don't know if Legion "good times" are possible unless Blizzard intentionally lets the game get as bad as it was in WoD again.