You can't seriously quote the clearly non-original text if you're making that argument. You need to go to the source. I don't have the ability to, otherwise I would, but a revision of a revision of a revision of a translation of a translation (I hope I didn't miss any!) of a many-thousand-years-old text doesn't cut it.
Nintendo also tends to have a slow start with almost every console and handheld they put out, though. As their first party library grows, they get a year or two into development, and start releasing their onslaught of killer apps, which pushes their console sales extremely hard. As an example, Pokemon X/Y sold millions of 3DS + variant units. Mario Kart 7 and Super Mario 3D Land combined are a third of all 3DS software sold in 2011. Nintendo has always had strong first party support, but it's been the mainstay of their consoles since they lost Rare to a MS buyout.
Sony, OTOH, doesn't have the insane first party development that Nintendo does. They rely almost entirely on 3rd parties for their killer apps (off the top of my head, Gran Turismo is their only major first party franchise). The Vita doesn't have the 3rd party developer support of other Sony systems, yet it's still basically down to 3rd parties to create a breakout hit to save the platform. Sony's in a bad spot with the Vita, and doesn't necessarily have a way to save it. Nintendo's consoles almost always have a way to rebound in a huge way because there's excellent development teams that are locked in by virtue of working for Nintendo.
And you're comparing this to SteamOS boxes? I don't recall Valve or any of its hardware partners saying anything about running games on them that aren't yet approved on Steam.
Considering that it's a Linux distribution, Valve is encouraging users to replace both hardware and software, and Valve isn't going to even be making any SteamOS exclusives, the possibility of them locking it down are near zero.