Nevertheless, a much more capable inter-app file sharing capability would be more than welcome - for example, to share multi-Gigabyte video files between video players. (Currently, there's no "best" video player. To achieve everything you can do, you need to grant access to at least two different players to the same file, assuming it's, say, an MKV file. For more info: I've published tons of info on this HERE, in my symlink bible.)
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I'd LOVE such a thing - to be able to run all my apps, both iOS and OS X, in ONE device to take with me. Particularly if it supported Wacom / n-trig styli and if it had a powerful CPU and 8+ GB of RAM, so it could be even used for serious work.
Agree on file system, my thoughts were that file system access on iOS will never happen, but access via the default app is still more than workable. File s haring, yes, another not needed restriction.
Your thoughts on the OSX/iOS device is what the SP3 is, and it is compelling if the hardware form factor was ok enough. Compromise, yes, but if the compromise is smaller than the benefit, yes, great idea