This idea is essentially a cosmetic improvement. It would be useful if the Delete geoprocessing tool reported in its messaging how much space was recovered. I might select up multiple FeatureClasses in a file geodatabase and delete them. But how much have I recovered?
Yes I know you can open the Catalog View and see the size, but I rarely access that view other than for metadata.
As ESRI want us all to be using short-cut key strokes I quite often delete data using the CRTL+D approach as well as the geoprocessing tool. Would be good if both methods reported something as simple as "300MB deleted".