IQ is very varied and always has been. I remember a question in one paper of the 11-plus "How many legs has a three-legged stool?" I suppose today that some kids won't know what a three-legged stool is or why it's only got three legs but when discussing the test afterwards, one lad said he'd answered that question "Five". He insisted their milking stool had five legs and wouldn't have it that milking stools had three legs so they always stood firm on the uneven floor of the cow-shed!

The school curriculum today is wide, far too wide so that not enough time is spent on kids mastering the basic "three Rs". For the first "R", it's so important to be able to read well because it's the key to everything else?

Your point about capital letters is valid but today capital letters are often used (wrongly?) in emphasis of of some item or other. On the other hand, you must have seen great long posts on here with no capital letters, little or no punctuation and no paragraphs?