Wrong.
Massive Nerfs have happened long before Trials came out, and if you seriously think that Thorn, PRs or the hammer of soll weren't even bigger problems in 6vs6, you are kidding yourself.
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Why I used "most" and not "all."
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And I am glad that you did! However my "wrong" was simply directed at the comment of balancing happening especially for/because of trials. Trials is only a small part of the Crucible and definitely neither the focus of the community nor of the balancing team.