It’s small, it’s reversible, and it’s designed for a long connector life (the part that wears out most, the retention springs, are on the cable side)
It also has enough pins for USB 3 data use, unlike the 2.0 micro-b connector, and includes additional contacts that can be used for features such as dual high speed lanes (up to 20gbps with Gen2x2), Thunderbolt, VirtualLink, Displayport, or other protocols. (The usb-c connector can use up to 4 superspeed pairs, instead of the 0 on the 2.0 micro b connector)
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