Honestly I'm surprised MS hasn't done more with the great dockable interface UI tech they built for for Visual Studio a few decades ago, and also gradually adop

Honestly I'm surprised MS hasn't done more with the great dockable interface UI tech they built for for Visual Studio a few decades ago, and also gradually adopted by Adobe Photoshop and every other productivity application. I don't know if MS invented it but they definitely mastered it well in oldschool VS. Let me dock/add-to-tabbed-pane/split-dock-into-multiple-panes and have the autohide/pin toggle for any window attached to any any edge of the screen, and make the Taskbar and the Quicklaunch and the Start Button just another set of Pane Windows, just with enforcement that (where appropriate) they cannot be closed or otherwise removed from the active screens, with a redundant always-accessible explorer rclick-context entry just in case you've somehow completely lost them. Then make "maximize" mean "join the central pane as a new tab".