Blizzard intended to release expansions faster since WotLK. Had nothing to do with WoD in specific.
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With the massive failure Azerite is I don't see any chance Blizzard will give us three content patches this expansion. No f* way. Get real and don't be so delusional about BfA. It's been a failure from scratch.
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It's not... by facts. And even Blizzard knows it. You might like it but BfA is factually a very underwhelming / bad expansion.