As a storyboard artist, when I work on a show I am given hundreds of files pertaining to that show, and the files have to be organized very carefully. There is a folder for each episode I'm working on, with subfolders for each type of information pertaining to that episode (backgrounds, character designs, audio recordings, script, etc.), and usually one or two more levels of subfolders. I often need to add some of my own files and folders into that folder structure. And as I work, at certain points I browse through a particular folder that pertains to where I am in my work, to see what files are there and which I need to use at that time.
So I don't understand how having all of this data invisible to me would help me, except to help me lose track of which project I'm working on, which files are associated with it, and where I can find those files. Not only that, but if I ever need to pass the project along to another artist, including all its files, how would I do that without a file system? So to the anti file system crowd I ask, if a file system is not the answer to this real world scenario, what is? I'd really like to know.
If file system via cloud storage is the answer, then we all agree that file systems are indeed necessary for people who work on complex projects. I really think you can't get around it: when you have so many files (numerous and span across multiple projects, subjects, filetypes, etc.) that they need to be organized, then you simply have no choice but to organize them. No one else, especially no software, is going to do it in a way that is most practical and efficient for you. Automation is great for things that take no thought, but it will always be horrible for things that do.
By the way, in the video, Steve doesn't seem to speak against file systems at all, just against local storage. In my opinion, it's great in theory, but not in reality. In its current state, cloud storage in iOS is a bottleneck for work flow and in some cases not feasible at all, not to mention it forces you to pay monthly for your own data (which is especially a sore spot when you have a 256 GB iPad with plenty of free space). If Apple really wants the iPad to replace PCs for people who actually work on projects, they need a much better answer.