"Loverde claimed IDC still does not view tablet computers as "functional competitors" to the classic notebook due to their limited storage and file system access and scant focus on productivity."
That statement is wrong on all three counts.
The iPad comes with up to 128GB SSD. That is equal to or larger than the SSD's that come standard in notebooks.
"Scant focus on productivity"?
The fact is that any task that can be done on the average notebook computer, can just as easily (sometimes more easily) be accomplished on a multi-touch computer. Everything from creating and editing Office files, to application and HTML coding, to multi-track audio and video editing, to 3D modelling and rendering, etc., are all tasks that are being run on multi-touch tablet computers.
"No file system access"?
Current desktop operating systems are file-centric, and so they rely on filing systems. On the other hand, iOS and Android accomplish the same tasks but by being app-centric.
The files are still there in iOS and Android, but there is no longer a need to waste time and effort sorting files into a hierarchical folder system, and then later having to look through those folders (containing a mixture of different files) just to find and open the one you want.
Many people have a hard time grasping the essence of this change, and so they call this new type of operating system a "toy" when in actuality it makes the user MORE productive than they have been using desktop operating systems.
In iOS and Android, apps will only see and open files that the app can handle. Any other files that it can't handle are not seen. Files that can be shared (for example photos) can be opened by multiple apps that can work on those files... but again any other files that can't be worked on are not seen by the app. This makes perfect sense, and it eliminates the time wasted going through a filing system before you can start doing what you want to do.
Sometimes a user may want to use a file system in iOS and Android, and that is no problem at all to do. There are many excellent apps that allow you to create your own file hierarchy in iOS and Android, but unless there is a special case where these file systems are needed, these apps defeat the purpose of having and using an app-centric operating system.
For some people changing to a more modern and productive system is easy, but for others accepting change is difficult.