It's an example of adjective/verb nounification.
Casual => casualize => casualization
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You can also do Ashran to advance your character. CP was never easier to get in unratde PvP than it was this expansion.
Of course easy PvP gearing goes away next expansion. Which may not be a bad thing: they seem to have realized too much content in WoD was rendered effectively rewardless by other content overshadowing it.