Parts that look alike are rarely interchangeable. Two bearings with the same outer size have different load ratings, two screws differ in thread pitch. People on the floor end up squinting at stamped numbers, leafing through a printed catalog, or asking the one colleague who knows.
Counting the parts room has the opposite problem. Someone walks the shelves with a clipboard, writes part numbers and quantities, and someone else types it all into a spreadsheet. Each step adds a chance for a wrong digit.
Most of the information already exists in your ERP or a spreadsheet: part number, description, dimensions, material, where it is used. Put that list on a phone and the bin label becomes the key to it, both for answering "is this the right part?" and for counting.