Why is file system necessary?
Holy smokes. Are you even pretending to be serious right now?
Consider, for a second, what the file system of an architecture firm looks like. Or a machining company. Or a car company. Or a bicycle company. Or a drug company. Millions and millions of interconnected files of all types coming together all organized in specific ways with huge hierarchies of strict naming conventions ensuring functional access and control from countless software applications current and legacy in various locations on multiple networks and a mess of permissions and delta versioning and QC and approval processes and corruptions and recoveries and on and on.
And all that is going to what, magically sort itself out and work smoothly without anyone ever seeing what they're doing? A room full of monkeys would actually have a better chance of typing hamlet.
And then, we're supposed to keep entire extra sets of exported ipad-friendly filetypes of all this data, for access by a "professional" tablet running an operating system borrowed from a phone? This is not realistic.
The only way anyone is successfully separating the human from the file system is by putting a very reliable AI in charge of keeping it running instead, and even still you're going to need at least periodic oversight.
As much as I love Apple, and I do, they are making it really hard right now by stubbornly treating tablets as mobile devices, presumably to avoid encroaching on those golden MBP sales.