Clearing intermediate results can be useful to save space. However, in the GUI, there is no indication as to how much space is being taken up by the intermediate results.
It would be useful in the “Details” tab on the righthand side of the GUI to add a line giving the current space being occupied by intermediate results for the selected project/workspace/job).
Also, there is currently no size breakdown for a selected workspace - only for projects and jobs. This would also be useful to have when spring cleaning!