Interesting about the fluoride. This all makes sense—AFAIK the US is an outlier on having lots of high profile lawsuits about things.
FWIW you can buy regular non-iodized salt in US supermarkets. You need it for things like pickling and canning, since iodine causes some sort of problems (I’m not sure of the details).

IDK about any other kinds of screen, or anyone else’s eyes, but my laptop screen is mostly unusable in more than maybe 500 lux brightness, maybe less. Which is annoying, because work is when I want the most light.
Preferred brightness is also a big difference between me and my wife, since she likes much dimmer lighting than I do.