Calling it a "major issue" is quite a stretch, seeing as the vast majority of multiboxers, in WoW, have been multiboxing without any problems for years. It's only recently become a "major issue" for those who want to engage in mindless, AFK farming, and even then, there are plenty who've not had any problems continuing to do so.
First, there is no such thing as an "approved" add-on; Blizzard provides the API and add-on developers use it. If an add-on operates within Blizzard's Lua sandbox, then it's "approved."
Second, Blizzard has never, in the history of World of Warcraft, banned anyone for using an add-on that relied entirely on the API that they allow their playerbase to openly utilize.
Out of everyone who multiboxes in WoW, those who engage in stand-still or mostly-AFK farms are certainly the vast minority, and, while this might sound harsh, you will find little sympathy from most on this forum when it comes to defending action taken against those who participate in stand-still, AFK farms, as a multiboxer.
Also, the person you quoted has been called out on this forum for heavily misleading and misinformed statements before, so they're probably not the best person to be relying on as evidence of anything.
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