Simple convenience? Kind of like what's so great about car keyfobs or something else along those lines?
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Yeah, except that wasn't the case considering those devices couldn't draw any more power from even the more powerful adapters than they could from the bundled (weaker) ones.
Weird, because I'm 100% sure my iPT5 from 2012 charged faster with an iPad charger. 100%.
Post from 2011
https://discussions.apple.com/thread/2580579?start=15&tstart=0