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That hasn't stopped them from periodic stalinist redesigns in an attempt to purge other ports from their machines. But the audio jack always survives.
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I'm guessing there are some key "user journeys" for scientific / industrial customer base, that involve using 3.5mm jack for something other than audio signal, and said customers would probably sooner change hardware suppliers than deal with dongles and all the problems of introducing USB into the signal path.
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