>The iPhone, when connected to the computer, can be accessed like any other filesystem. You move files in and out of a folder called iPhone/Music.
People have problems with that. You don't, but it's a big issue to a lot of people.
How about this, they turn on iTunes all their iTunes music is available. They turn on music app on their iPhones, and all their music available (streamed or downloaded). Every song they buy, is automatically synced to all their devices.
Which is easier? Which one requires you to understand "syncing", or file systems, or copy-pasting vs. moving, or a thousand other little things that you need to have a handle on, just to listen to music on your devices.
As soon as you run into the need to move content seamlessly between programs, devices, and services--in ways the makers didn't necessarily imagine--you need some kind of universal means of interchange. Something that is infinitely flexible and controlled by the user. As it turns out, we've had this for a while: files.
Now, you can ask for tweaks to the way the filesystem is used. Want the primary interface model to be searching, rather than browsing through folders? Ok, that's great. Things like Spotlight are already a step in that direction, and they can be enhanced. Want tagging? Sure! While I don't see it heavily integrated into current operating systems, I'd imagine it would be very doable.
But none of this is incompatible with the current filesystem model. It would just be a layer on top.
This is exactly how Android works. I plug my Galaxy into my computer and it appears just like any other USB drive. I drag mp3 files, or folders of mp3 files, into my Music folder, and I'm done. Same goes for mp4 videos I might want to watch, or PDF files I might want to read, etc.
Is that not the way iOS devices work?
My experience has been the complete opposite. I find the file system, far, far more intuitive than all the ad-hoc ways various applications attempt to manage my "content" for me. With these apps that abstract away the filesystem, you can never really be sure you have the right mental model of your data. The way apps like iTunes store your data is just so opaque.
Indeed, iTunes is the perfect example of this problem. I can't count how many people have come to me utterly confused about how syncing between your hard drive, iOS, the iTunes store, and iCloud works. They can't understand it because Apple imposes an ever-shifting system of abstractions onto your music storage. You don't have music files anymore. You have songs stored in certain libraries, and those libraries can be "synced" with each other in ways that often result in strange error messages and loss of data.
Imagine instead that things worked like the old days: You just have MP3 files, and you can put them in folders. The iPhone, when connected to the computer, can be accessed like any other filesystem. You move files in and out of a folder called iPhone/Music. In this alternate reality, you'd understand exactly what you're doing. You wouldn't have to guess at how "syncing" is going to change the state of your data.