Why do people think iPhone 15 doesn't support USB 3.0 speeds (HW capable)? iPad Mini has A15 Bionic chip which is USB-C 3.1 Gen 1 (up to 5 Gbps). From: https://www.apple.com/my/ipad-mini/specs/
USB-C port needs to have controller. On video they clearly showed that A17 USB-C is SoC (on a chip). Are you implying that A15 doesn't have USB-C controller SoC?