I had to look it up cause I was curious, and according to this article, the frame data for a character is tied closely to the framerate and not because better hardware means bigger advantage... unless I missed that mentioned in the article

I think once you get into the 200s, you start getting diminishing returns. I'll probably stick with my 280hz, but I'm super curious as to what higher refresh rates feel like

I think there's a lot of placebo involved, but it does make a difference in games with direct competition. If 2 people in CS headshot each other, even being 1ms faster can flip the outcome in some cases. I can definitely see why you'd just want as fast as possible.