I have not used C1 in years, but I continue to use Media Pro. I have about 16TB of images (raw from six different cameras, & layered, compressed TIFF files with thumbnail), PDF files, Adobe Illustrator files, InDesign files, video footage from four different cameras and audio files in AIFF & mp3 formats. This is broken up into about twenty Media Pro catalog files, based on current client and studio use.
All media files are tagged with metadata & keywords—in Bridge—that is unique to the media. This is typically done on the job. This is critical. If it's not done, then finding any media file would be almost impossible.
Offline drives are catalogued by Media Pro before storage. Those catalog files are in their own hard drive directory to indicate that the data is offline.
When a client asks for an image or media, I open their corresponding catalog and type an identifier in the search slot (e.g., Thomas, heuchera, etc.) and the program shows all files with that keyword. If it's a TIFF file, I double click and Photoshop opens the file and I work the file as needed.
This process is so easy I don't know why it's more ubiquitous.