First of all, unless it's a music app or something that can run in the background, it's in suspended mode. Meaning it is using very minimal resources and has very minimal to no effect on the battery, because it is not updating. Secondly, the card view will only show the six most recently used apps. So it's eventually going to close. If a certain app stays in the top 6 then it's likey to be one of your most used app. It's beneficial to not close them, because of faster restart or switching (assuming the app has been Mango-ised).
EDIT: Most people don't realize this, but MS has been trying to advocate eliminating the "x" button since Windows Mobile days. If anyone can recall, WM preinstalled apps like mobile IE never had a way to exit out. The claim is that it takes more resources, such as battery and memory, to open an app than to have them open from a suspended state. So in theory, now that I think about it, battery can actually suffer due to constant closing and reopenning of apps.
EDIT: I do agree that multiple instances of the same app could be a waste. Rhody has made his voice heard at MS suggestion box. Please support it by voting: Fix Multi-Tasking
EDIT: Most people don't realize this, but MS has been trying to advocate eliminating the "x" button since Windows Mobile days. If anyone can recall, WM preinstalled apps like mobile IE never had a way to exit out. The claim is that it takes more resources, such as battery and memory, to open an app than to have them open from a suspended state. So in theory, now that I think about it, battery can actually suffer due to constant closing and reopenning of apps.
EDIT: I do agree that multiple instances of the same app could be a waste. Rhody has made his voice heard at MS suggestion box. Please support it by voting: Fix Multi-Tasking
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