In Arc, when I'm dragging or selecting feature classes into a GP input, the full path of the source is displayed. This is helpful, say, if I'm merging stuff from many different folders (Did I already add the feature class from the thumbdrive? Wait, is that last one from the laptop? )
In Pro....I have to hold the mouse over each input UI, or click on it, to get the same information:
Mickey Mouse? Yes. More steps? Yes. Is that as efficient, or as fast, as I can get the same information in Arc? No......Let's say I'm merging 10, or 50, feature classes. How is holding the mouse over every one of those is going to clue you in as to which ones are in the "box", and which ones are left to grab?