When has there ever been?
Well, consider 2001, when I could get an Xbox for $300 and a game for about $60. In comparison, my gaming PC at that time cost close to 3x that much, and the games cost a similar amount. Also, there's the simplicity factor. It's a little more complicated than "plug in the cartridge and turn it on" now, but there's also an OS that maintains itself, no need to worry about system requirements, etc. It's disingenuous to say that consoles don't have any features that someone's going to consider an upside. I prefer my PC in most cases, but consoles have the occasional perk.
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.
From what I understand, SteamOS is Linux-based OS. Valve's been quoted as saying that users "can alter or replace any part of the software or hardware they want". That certainly sounds like you're free to run any game that'll run on Linux anyhow.
Resale and rental of games.
Meh. I've never sold a game; not about to start.
Use with no Internet connection for weeks at a time, such as by deployed service members.
Can't really argue with that point. Almost all of the AAA games in the last few years have been DRM-laden, with online authentication via Steam, Origin, Battle.net, et al. It's less of a problem for me; the last few games I've played were either console games, recent DRM-free indie games, or games that were released 15-20 years ago. Those last two aren't going to be the most popular of choices, so you're left with....closed (but mostly foolproof) console systems.
while the summary is laudatory, fawning, even, it is not central to the decision
Funny, I had the same reaction when I read it. He seemed like a salesman for Google or something.
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Computers are useless. They can only give you answers. -- Pablo Picasso