I ran a quick VI Analyzer check across vi.lib with the 'Default Icon' test, and found the following 10 typedef clusters that are part of public LabVIEW APIs but have default icons:
It would be very easy for LabVIEW R&D to assign non-default icons to these VIs. Even if the icons were just text-based (so 'DATE TIME REC' as an example). And yes, text-based icons are not localized, but again, *any* icon is better than the default icon or a blank icon.