re: 4 Fixes Google Chrome OS Still Needs
But you say nothing of that in your list of "4 Fixes" Support Local Storage is your bullet point and then go on to imply that local storage is not supported and discuss file liberation cloud sync arguments. Those have very little to do with local storage.
As for "Accessing and manipulating locally stored files should be built into the UI as if that's a major use case, not an edge use case. It also needs to be more a part of the apps running on Chrome OS." The files can be "accessed" from the"File Manager" that is right there on the first page you see. From there you can view, edit(simple) and upload photos, play music and video, view and print pdfs, etc. The one thing you can't do from the file manager is open "docs" files (you can open local from the docs app) and I agree that Google needs to work on making and storing docs not created in the cloud.
Besides this what exactly are you wanting to "manipulate" on these local files?