The intent behind doing it matters. There's no legitimate reason to throttle the product other than self-serving interests on their part that negatively affect customers. It's not like USB-C or USB 3.0 are new technology. USB 3.0 came out months after the first iPhone was released, and USB-C came out when the iPhone 6 hit the market. Remember these aren't $20 portable hard drives they're $1000-$1500 "premium" devices.