Arbitrary window tiling (think basically the same pane-dragging UI that, say, VS Code has) and the ability to mark specific apps as 'keep alive indefinitely in

Arbitrary window tiling (think basically the same pane-dragging UI that, say, VS Code has) and the ability to mark specific apps as 'keep alive indefinitely in the background' would go a long way towards making iPads useful as all-around computers without even needing other major changes.