Not sure I like the capitals
Is black on white the best colour? isn’t there something about dyslexia and best colour guidance
The reason it is white on black is to give the best contrast for poorly sighted people.
In respect of people with dyslexia they have the ability to change the text, font size and background colour by using and saving their preferences on the accessibility key at the top of the page. there is a special dyslexia font included, ‘Open-Dyslexic