I agree with what you say, but only on a level where you and I and webmasters that are aware of this is concerned.
We are also aware that mysite123.com is indeed www.mysite123.com and the original question at the top of the thread is asking why can't google understand this? If we can keep things in perspective the question is relating to this known fact.
I'm sure I have read an above average amount, and I am sure you have too. And I still keep reading, and reading and reading and even the fine small print does not escape me. Yet only recently have I come across googl'e clandestine and miserly effort to address this issue.
Google provides an option to click a button for it to merge the two domains in its database. The button is in the most obscure place and out of reach of any living creature other than a bloodhound that can sniff it out.
I did not come across that by reading, and very few highly paid webmasters know of it's existence. So I think if the guy paid out lots of dollars and became a bookworm like you suggested, he would still come here and ask the same question, minus a few dollars in his pocket, and probably more frustrated.
Matt is a representative of google, I doubt if he has ever written anything that has not been filtered by the PR department before the contents of what he mentions becomes public. He has never been subjected to a bombardment of random questions by learned webmasters where he is on the spot. He speaks from a port hole, nudged and hinted at as to what and what not to disclose.
No, I don't think it is about reading or paying. I think it is about common sense. There can be no doubt about it. An infant can understand that the two domains are one of the same.