OK, had a look through the linked paper. The big graphs, on page 8, tell you that if you decrease the twist length - which would entail relaying all the copper

OK, had a look through the linked paper. The big graphs, on page 8, tell you that if you decrease the twist length - which would entail relaying all the copper in the entire network, at which point you may as well put down fibre instead - you will get -20 dB at 10 GHz over a distance of 0.5m, 50cm, less than two feet, instead of -25 dB in the worst case. In other words, instead of losing 99.7% of the signal over that distance, it'll only lose 99% of the signal. Sure, it helps, but consider me underwhelmed.