There have been a lot of posts like this, so I'm quoting you two as representative rather than to single you two out.
I've read most (but not all) pages of the thread, and a few articles on the 1m sales number, but most seem to be missing what I think is the real story. It's pretty weak reasoning to dismiss the launch sales with arguments as Ars presented: "if the other systems had as many units on sale, they'd have sold as many", or something like that. The real story was the supply, not the demand.
The question to ask is, why didn't any previous console launch have enough units on sale, if that demand was there? You gotta both drive up demand and have units to sell. Why is it that only Sony was able to crank out this many for their launch?
Console launches are massive, years in the making logistical challenges. I'd love some journalist to ask the question, "Why was Sony able to have over one million PS4's available for sale in North American day 1, when no other system could pull it off, despite supposedly having the demand?" And then follow that thought through. What about the PS4's design enabled it to be manufactured more easily than prior consoles? How did Sony overcome supply line bottlenecks? What are the logistical challenges in getting that many units into the channel so fast? What were the specific lessons Sony learned from the launch of prior Playstations that enabled them to achieve this result? (We can surmise some of the answers on our own, of course.)
How did Sony pull this off when no one else ever has, if prior launches had enough demand? That's the real story here and Ars missed it entirely. The author would do readers a greater service to dig into that question and do a little journalism rather than just dismiss the impressive launch numbers with "well the other guys had lots of demand too" stories. But that's harder, of course.