You are confusing latency with throughput.
If you are downloading 1MB of data the difference in delivery between the two speeds (42mbps vs. 72mbps) is 80ms (190ms vs 111ms) Hardly life-changing.
If you are downloading 1MB of data the difference in delivery between the two speeds (42mbps vs. 72mbps) is 80ms (190ms vs 111ms) Hardly life-changing.