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iPhone 15 Models Have 'Completely Standard' USB-C Port Without Restrictions on Accessories
(www.macrumors.com)
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The difference isn’t just upgrading to a 3.2 controller, it’s literally a different chip. The A16 vs the A17. Unless you’re suggesting they add a secondary controller to the board? Which doesn’t actually work, since the A16 wouldn’t be able to support the speed difference, so you’d have a 3.2 controller locked down to 2.0 specs anyway.