Does EVERY app need to remain open?!

Multitasking can be pretty cool on the iPhone - but is there any way to close an app completely rather then be forced to have EVERY app remain open?
For example, I may check a text message.
I press the home button to exit, but then need to click the home button twice to actually close the app from the multitasking bar.
Why cant I just close the app for good?
Would it be that difficult to have an option where you have the choice to either keep the app open, or terminate it completely?!

Multitasking has been supported with the iPhone since day one, but 3rd party apps could not run in the background until iOS4.
It is not a multitasking bar. It is a fast app switching and recently used apps bar. All apps - the included apps and 3rd party apps available in the fast app switching and recently used apps bar are not running in the background, so there is no need to be constantly removing apps from the fast app switching and recently used apps bar. Removing the Messages app from the recently used apps bar accomplishes nothing. It does not quit or close the app since the app always remains open in a suspended state for when a new message is received.
With 3rd party apps, the overwhelming majority of 3rd party apps will continue to be quit when pressing the home button to leave the app since there is no reason or benefit for the majority of 3rd party apps to be running in the background.
Some 3rd party apps such as a game will be placed in a suspended state when leaving the app so when returning to the game you can begin the game again where you left off instead of having to re-launching the app and beginning the game again from scratch. An app placed in a suspended state is not using any processor cycles or battery since it is suspended - open but not running in the background.
A few apps - very few apps such as a music streaming app and a GPS navigation app will run in the background when leaving the app.
Would it be that difficult to have an option where you have the choice to either keep the app open, or terminate it completely?!
This is up to the 3rd party developer for an app that includes the option to run in the background, which are few and far between.
This link explains how this works quite well.
http://whenwillapple.com/blog/2010/04/19/iphone-os-4-multitasking-explained-agai n/
Message was edited by: Allan Sampson

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