I used to be able to use the ↕ column to reorder questions when creating/editing certain types of quizzes by long pressing the column and dragging the row to the desired position. That no longer seems to work.
I guess I’m not surprised that it still works on desktop. Until I noticed this loss of functionality, I never had any complaints about the mobile editor … and I consider this relatively minor, since there are clunky (but effective) workarounds.