Most people who want 40Gbps can diagnose the issues, the rest will assume "Oh, it takes 6 hours, better plan for it, that's how it is". But it will work every. single. time. at those very slow 2.0 speeds.
What they should do is give a popup saying "You have a slow cable, it could be faster, go rummage till this message goes away and mark the good one with a sharpie", and that wouldn't need any changes to the spec
They've chosen reliability over quality. Cheap reliability is a great thing. We did fine before fast hard drives, we can often live without them. But we'll want to scream if we can't get it working at all.
What they should do is give a popup saying "You have a slow cable, it could be faster, go rummage till this message goes away and mark the good one with a sharpie", and that wouldn't need any changes to the spec
They've chosen reliability over quality. Cheap reliability is a great thing. We did fine before fast hard drives, we can often live without them. But we'll want to scream if we can't get it working at all.