It depends on what you’re doing. I’ve never had a problem with USB ethernet adapters (I expect most of them Realtek) on macOS, but I generally haven’t been tryi

It depends on what you’re doing. I’ve never had a problem with USB ethernet adapters (I expect most of them Realtek) on macOS, but I generally haven’t been trying to push sustained gigabit speeds for long while sharing the bus with other devices. While driver quality is mentioned, sustained speed seems to be a big part of what they’re talking about (hardware offloading, bus bandwidth, etc.).