Basically they were near the pinnacle of perfection in vanilla then Ghostcrawler got hired, completely dismantled them, tried to rebuild them in his own inane vision of what he thought the class should be like and has been trying to fix the mess he made ever since.
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That is like saying only bad drivers get hit by drunk drivers because great drivers learn to avoid them, when it has absolutely nothing to do with their driving skills and everything to do with the drunk driver.
The point is players should not have to adapt!