This Apple-centric USB computer accessory site was launched in 2010 when the SuperSpeed USB 3.0 specification was only just starting to take hold. By late 2012 Apple began the USB 3 rollout in earnest, completing its transition with the Cylinder Mac Pro in early 2014.
In early 2015, Apple introduced it's first reversible USB 3.1 Type-C connector Retina display 12" MacBook, ushering in the NEXT generation of USB connectivity on the Macintosh. Note that Apple is using USBC-Rev-1 which keeps the data speed at 5Gbps. It will take more time for Apple to incorporate faster Rev-2 USB-C chipsets in future Mac models to double the speed to 10Gbps.
It was clear that the transition to USB 3.X would be a technological inevitability. But it takes time for computing standards and manufacturers prototype and test and refine to bring new technologies and products to the consumer marketplace. That's normal.
USB 3.X evolved first on the Windows platform. The payback of ROI was greater in that market, and SuperSpeed product manufacturers followed the money trail. USB 3.X PCI-e and ExpressCard upgrades for both PC's and a very few select Macintosh models
In some ways, widespread adoption of SuperSpeed USB 3.X may have been rather deliberately delayed by Apple and Intel. They had a vested interest in assuring the emerging ThunderBolt I/O interface got established first, and both drug their heels incorporating USB 3.0 support directly into their logic-boards until 2012.
At least during the interim, gadget makers had a long window to get products out there. Most notably, the external hard drive scene has completed a transition to broad adoption of USB 3.0 ports across many laptop and desktop drives.
As for other types of USB 3.X peripherals, we're still waiting for a larger range of USB 3 products for music recording and HD video capture, SuperSpeed scanners, printers and other devices. Some PC and Apple pheripherals just don't need the speed of a USB 3.X port. That's okay, just as the USB 2.0 spec served us well for nearly a decade, the speed advantages of USB 3.X gadgets provide a compelling opportunity for computer gadget and device makers to leverage the extra bandwidth that USB 3.X provides when appropriate -- all while preserving backward compatibility with existing USB 1.1 and USB 2.0 ports.