Them main problem is that to get high bitrates over anything longer than 2m you probably need a glass fibre. And that increase the cost a lot, and makes the cab

Them main problem is that to get high bitrates over anything longer than 2m you probably need a glass fibre. And that increase the cost a lot, and makes the cables more fragile. Corning offers an optical USB3 cable where the optical converter fits in a slight-larger plug, it's not impossible. But most people wouldn't pay for it it when they don't need 50ft cables.