Is it hard to understand that for some people it may be difficult to read ? It might be due to motivation issues, thrust issues, or concentration issues. While at the same time they may have a rich inner imagination or thinking that they would like to share.
My impression is that humanity might miss valuable insight by rejecting whatever is not "well written" whatever the reason might be.
You may feel yourself very luck if you don't have any difficulties to read and write. Avoid to judge severely people who don't share the same facilities.