Comment by harshreality
16 hours ago
Ethernet is different in part because it's for much longer cable runs (both average and maximum) than usb is. It's a lot easier to maintain signal integrity for 10 gbps or 40 gbps when you're dealing with a few meters maximum (0.8m max I guess for usb4?).
There are DAC cables for 10G and 40G (actually 4x10G) Ethernet which are only a few meters. The newer USB standards' physical layer and other characteristics actually resembles Ethernet in many ways.