Their general conclusion is focused on competitive gaming performance, which while certainly a valuable litmus test (especially for their target audience) does not tell the whole picture.

Optimum has reviewed some higher refresh rate monitors recently and provides some examples of where they can still give an advantage, not necessarily in reaction time but in smoothness and clarity in fast scenes. Here's a good example with a 540Hz display: https://youtu.be/nqa7QVwfu7s

One advantage in the market that is overlooked in this type of "do we need X" challenge is the increased accessibility of things less than X. For example productivity monitors at 120, 144, even 240Hz are more affordable and easier to find, as panel production becomes cheaper and the gaming brands push the marketing numbers up and up. New 480/540Hz monitors cost what a 144Hz monitor cost ten years ago.