On desktop, new editable notes and todos can be created in the Trash notebook with the keyboard shortcut. They adopt regular note context menus, but their Delete note menu item is disabled. Moving them out of Trash doesn't enable Delete note. It only moves them to the ... notebook (which the notebook list doesn't show). I could only delete them using Permanently delete note from the Command Palette.
I could expect note creation to be prevented with a popup saying notes can't be added to the trash. Other expectations include the below: