No disrespect but I fixed a small discrepancy for ya. When you add in the idea that Windows Store apps are designed not needing to be closed all of a sudden this makes the Windows Store app taskbar pretty useless. Do you close the apps to make the taskbar useful or do you leave the apps open because you are not supposed to have to close them?
That's true of the taskbar in Windows 7 too, but in practice people don't tend to have bajillions of applications or WSapps open at a time, so it's not a big deal.
Generally you only want a complete list of apps if you've lost something you were using ages ago (in Metro you get this by clicking the app again from the start screen) or to close down the apps you're not using (you can do this via the new easier-for-noobs-to-use Win8 task-manager or by right-clicking the items in the Metro-taskbar to close).
Apart from those two things which are both catered for in Win8, what else do you need the Metro-taskbar to do that it doesn't currently?