If being unique is down to missing features that the competition has, then it's uniqueness is a bad thing.
Your impression of what the competition is limited by your idea that WP was competing against Android which was never the case.
MS wanted WP to be the new iPhone. The mistake that people keep making is thinking that MS planned on going to emerging markets, that was never the case, it was Nokia that took WP there, not MS. It is this group which is most vocal about wanting features like a 'file manager', SD app support and things like USBOTG. Don't get me started on background images...
I just hope you're not all too disappointed when things aren't what they seem. There won't be a file manager like Symbian or Android. It will be integrated within Onedrive where Onedrive is more integrated into WP. This is something that's been said for some time. As for the rest of what this thread is about, whatever. USBOTG, I had it on my N8. Used it once. Only people who have any need of this would use it. Same goes for a file manager.
Be clear on another thing. iPhones don't have a file manager. They are also very similar to WP in the way they function. The difference between them WP and iPhone has been the opening of the SDK to allow better apps. This is what WP needs to do and appears to be doing. This IS what is most important. Features come and go but a good open SDK to make killer apps is what is needed. This is where WP has fallen down so far.
Also for my friend up there. With the Nokia N8 you could hook up a powered external hard drive, HDMI cable out to a monitor and use a mouse. It was literally a small computer or a media player. People did it. I prefer that we move away from this idea personally as smartphones have become something unique in themselves but people keep wanting to return to this idea.
WP is a great platform. Different in its own way from the competition, however, many only see the negatives. It needs to be updated, it needs better features. Does it need the kitchen sink too though? That's my question for you.