Well, we don't know what we don't know. I'm not going to rule it out, but I'm inclined to believe that as well. Honestly I'm fine with it as long as I can do stuff with my files, whether it be an import into Lightroom or plugging in a USB drive to email someone something. If I can go to attach a document in Mail and it lets me browse the USB drive, then I consider that a win. But I also have to wonder how they would do this differently. Currently if you go to insert an attachment, it lets you pick from various "locations" such as iCloud, on my [device], Dropbox, or whatever else you've added. Would make more functional sense for it to just show up as another location, and if that's the case, then why not also show it in the Files app for consistency? But if they just make it a thing in the image picker, like a tab at the top for external drive, then that would be unfortunate—especially if you can only do images/video and not music files, documents, PSDs, etc. In a perfect world we would all have fast cloud connections everywhere and clients would use that. But in the real world clients still give us crap on a flash drive, bosses give you presentations on a flash drive that you then have to email to yourself because the machine you're presenting on at a conference has a web browser but no accessible USB ports for security reasons, etc. Crap happens and full access would be great. But even this limited access would be huge.