Comment by TeMPOraL
12 hours ago
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.
My guess is MacBooks are just used for pro audio work a lot where latency is unworkable. While few have latency sensitive work on an iPhone.