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Apple iPhone 15 relegated to USB 2.0 unless you buy the Pro
(www.pcgamer.com)
This is a most excellent place for technology news and articles.
That's not the only reason for fast I/O though. Yeah it's convenient for a quick transfer/backup of large files but there's also the ability to use peripherals that require higher rates. USB3 has been around since 2008 so it's not really unreasonable to expect a modern phone to support a spec that's over a decade old...