Too many people cannot maintain attention for more than a few seconds while reading. Or they read "what they want to read" instead of the actual text. Like I write a "list of things" and they read it like "a set of things", loosing the meaningful ordering of a list.
I tend to write concise documentation, but people always loose some important details that way. So I am now purposefully adding more text than strictly required to be sure important points are really understood.
Like a good teacher repeats at least 3 times the same matter, with a slightly different angle