You.... you didn't read any of those, did you? Truly?
Well lets go through them then and see if there is any stock in any to them (TLDR: There is not)
First link, irrelevant discussion related to persistence of vision for video, and it talks about the lower levels of required frame rate. Though according to it with their exactly 0 sources, its not until you get lower than 12 frames per second our brain find it a bit unbelievable. Yeah.... no, my eyes cry far before that. Also unrelated since lowest amount of framerate is not the same as what benefits you can draw from higher framerate. Two different things.
Second link is a random toy, no sources, discusses nothing of relevancy.
Third one is wikipedia, which is in fact not a source. Though again thats related to persistence of vision. Which is about fooling our brain to believe a flicker of something is actually solid. Which is still, unrelated to this. Solid or not is not what we are after with higher refresh rates. It is if we can determine a difference, and thats not the same as persistence of vision.
forth one is a is
100 years old, it does in fact contradict some of the previous links as well so I have no idea why you are linking to that. Or well I do, its because you did in fact not read it, you just googled and picked some links that sounded relevant when in fact, its not. Though I love old-schooly language used.
And the fifth and last one is a funny one. Its actually about creating something low powered, which means least amount of updates, so stay on as little as possible to fool our head in to thinking its something there and they push out this funny line.
"Due to the fact that human eyes can only render about 10 images per second, the fast spinning LEDS seem like a solid display."
Page 11312.
Yeah its easy to say this, if thats what you take as reasonable arguments to support your case for this, ignorance is definitely the correct term.
Persistence of vision is not the same thing as the ability to detect changes. They are in fact, opposite things. What you should be looking at is the shortest amount of time something is needed to be displayed for our brain to register a change. This is the exact opposite of persistence of vision. Because what we are after is not exactly to fool our heads to believe its a solid image or fluid movie. But edge case change detection. And the fact that you throw a bunch of neigh useless links related to persistence of vision to support your argument kinda says a lot about you missing the point of it by about the broad side of a barn.
Not sure I think there is a useful reason for a 500hz display, unless maybe used for 3d or something so it flickers between two fields with refreshrate to spare.