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Explained: Why you can't move Windows 11 taskbar like Windows 10, according to Microsoft
(www.windowslatest.com)
This is a most excellent place for technology news and articles.
Why would applications have to consider relayouting? Isn't that entirely in the hand of the Windows taskbar?
It shows the window groups, windows, pops over previews of windows or tabs in a consistent style, presumably owned by the taskbar itself. At no point do applications themselves control their positions or size in the taskbar or the taskbar popovers.
If the taskbar position changes then the screen dimensions available to applications change - windows may need to be moved and resized. The applications themselves handle that. Of course, they need to be able to do this anyway so it's not really an issue.