A significant number of other programs which organise media contain a “drill down” mechanism whereby, if selected, the software reads all of the images in a folder, including those in a subfolder and displays therefore a flat view of all the images in a folder hierarchy.
Kyno and Luminar spring immediately to mind in this regard.
I have purchased PL3 and am happy with it’s workings for RAW development, but this function would make it workable as a DAM, which currently I dont find it to be.