[tonymet]

It's not about refresh rate it's about responsiveness. As close to 0ms as possible. On kindle there's a frustrating amount of input lag

[TillE]

The response you're waiting for is a refresh of the screen.

The Kindle excels at being a low-cost device for reading novels, or linear non-fiction with no graphics etc. For anything fancier, it's simply not built for that.