There's nothing particularly preventing multitasking with a small memory footprint. The (by far) biggest memory eaters on modern computers are Javascript heavy webpages and it's pretty much only if you have multiple tabs open. Just limiting open tabs to 1 or 2 instead of 8 could be enough to drop the OS reserve by a full gigabyte. Drop Flash support as well and it goes down even further.
There's very little to warrant a 3gb reserve in any case and even my Flashless 512mb iPhone 4 still handles multitasking with aplomb. iOS, OSX, and Win8 all kick dormant programs out of memory and there's no reason that the new Xbox OS shouldn't do the same. In fact, it's one of the core new features of Win8. It's also the reason why I think this rumor is a complete load of nonsense.
I guess that's why you have smartphones shipping with 2 GB of memory now and more in the future. Because they don't really need it?
As to being required to browse with only 1-2 tabs. Ugh, no thank you. I browse with multiple tabs on the TV regularly. Sure if you
have no other choice, people will do it. But why limit what people can do so arbitrarily when the user experience can be better.
3 GB isn't about the minimum that is possible. It's about giving the fullest user experience possible. Smartphones don't
have to have 2 GB of memory, but they do as it enhances the user experience compared to phones with less memory. The same applies here.
I'm sure MS could lower the reserve OS partition, but why?
Multiplatform titles are unlikely to make use of significantly more memory than what the competing platform is able to offer. 5 GB for games is already more than the competition has in their entire console.
So why not reserve 3 GB for the OS and applications to drive a much more feature rich user experience when not in game? As well as the ability to have it always on and always available even while in a game. And remember that entire 3 GB may not be for user launchable applications either. There's always the possibility that memory is used for improved natural voice recognition by having a larger vocabulary of words on system. Improved skeletal recognition by having a database of potential skeletal points to match to the point cloud from Kinect, etc.
Sure, it's always the case that you can go with a barebones minimum app. I know people that prefer to use command prompt only applications on their computers running linux. No graphical interface at all. Text only. In that case we'd really only need 4-8 MB of memory for our console OS.
Not going to happen.
MS has decided that they think there's a potential benefit to the consumer to have a very rich living room media experience with the next Xbox. Not something pared down. Not something that's purposely limited to fit within the context of a tablet/smartphone experience on a TV, but a full blown lets see what we can do in the living room experience.
In the same way you have AAA games, presumably this would allow them to have a AAA living room experience versus the barebones experience that PS3 and X360 offered.
Regards,
SB