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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.
TLDR: We rewrote the taskbar and didn't bother implementing it.
What's weird is that given certain odd scenarios (I can't recall it but there was a video by Enderman about it) you'll see the old windows 10 taskbar appear, exact styling and all. So the windows 11 taskbar is quite literally just a WebView plastered on top.
This really stuck with me. “Rewrote” implies feature parity. What they really did was replace the taskbar.