I would love a completely customizable desktop system.
Be able to select different window arrangers, docks, etc., for each workspace.
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Thinking bigger, something useful would be persistent and named "worksets" of workspaces, that can be closed and reopened. One workset at a time, or multiple.
It would help to be able to view/edit/access the same docs and tools in multiple windows, across workspaces, with different sizes and placements. Think the same Word doc, open in different workspaces, with disparate sizes.
I would optimize worksets for every possible context: crafting areas, development projects, regular tasks, etc.
The result would be dozens of worksets, that let me return to useful contexts months or even years between visits. So the workset manager should allow for hierarchical organization.
And I would want worksets to sync across devices, along with my regular file and app syncing.
Yup. That's it. That is all I want!