Using the app screen as a task switcher would be terrible idea in my opinion. When you mix up icons and running apps as icons confusion is the result. It also takes away the best feature of the multitasking screen - being able to see what the app is doing at a glance. For eg., you may be downloading something and just want to check whether it has finished and this can be done without maximizing the app as the mini screens are live. This is where we have to agree to disagree. When it comes to interface everybody have their own personal opinion so there is no satisfying all. The designers have to take a middle path which they think will satisfy the most users but there will always be detractors. I don't mind swiping an extra screen to get to the screen I want, it take negligible time. Right now my main grouse is the lack of folders for the app screen which makes locating an icon time consuming. However I understand this is coming in PR1.2.