hot take: USB 3 / USB type-C sucks. speeds over 1 Gbps? many motherboards only route PCI-e 3 x1 to the USB controller so nope Ethernet alternate mode? doesn't exist Thunderbolt alternate mode? exists but Thunderbolt chipsets are fucking unobtainium without public docs
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By the way, USB3.0 physical layer is almost the same as PCIe gen 2 physical layer. USB 3.1 physical layer is almost the same as PCIe gen 3. Except USB 3.2 uses an encoding scheme more efficient than 8b10b.
